I wouldnt care if it was 1 per week. Less times i have to throw the junk mail out...Clearly you don't buy or sell anything online. Small items such as DVDs, games and under-2cm-thick books aren't sent as parcels unless you deliberately put them in a satchel/box or request to pay the parcel rate at the counter (or if the staff member is a moron who thinks anything that isn't a single flimsy piece of paper in a 1mm thick envelope has to go as a 500 gram parcel).
As of 2020 (for the people in the future reading this) it costs $2.20 or $3.30 or $5.50 for a large letter, compared to $8.95+ for a parcel of the exact same size and weight. The huge discrepancy was due to yet another of Australia Post's money-making policies, when they discontinued the 0-250 gram parcel rate early last decade (the 250 gram weight bracket was one of the most-used items). They are charging more than double the minimum parcel cost (which is apparently required to be no less than four times the base stamp rate, likewise if a rival mail service wants to start a business - got to love how the Australian Government is above the law when it comes to anti-competitive practices, and can write its way out of anything that would put it at risk of falling foul of its own laws) all while providing less than half the service, and keeping the post offices closed every weekend and public holiday like we're still in 1970s Western Australia.
Why can't they team up with a company such as Officeworks (who recently dumped Mailman aka Fastway) or Coles/Woolworths and have a competent 7 day a week, long-hours postal service like other countries have? For what it's worth, Officeworks already sells stamps and is open much later and 7 days a week. Clearly Australia Post has no issues dropping off Express Post parcels at 11AM on a Sunday morning (because Express Post = $$$$$) like they did for me last week; it is beyond belief that you cannot actually go to a post office at the same time to post such a thing in the first place (when Melbourne went into stage 4 lockdown, most if not all official Post Shops lost their half-day Saturday trading). If you are dumb enough to drop a paid-for parcel in a street post box, you don't get proof of lodgement or a tracking number (unless you used one of their own prepaid satchels, but even then it won't get its initial scan so eBay's Money Back Guarantee will just love that - freeBay for buyers, feeBay for sellers).
Speaking of junk mail, most of it is delivered by hand by unauthorised people rather than through the post thus Australia Post can't do anything about it. I just can't imagine the postie going house to house dumping 5000 Aldi catalogues in each and every letterbox when they are already run off their feet due to the postal service's useless hours and days of operation (it's ten times worse when there's a long weekend, and a thousand times worse during the Easter/Christmas public holidays). There are more things for AP to worry about than junk mail, such as the reuse of uncancelled stamps and Postage Paid envelopes. The computerised system they use to automatically postmark envelopes is completely useless. Half the time the orange barcode (which shows up brightly under UV) and date is upside-down on the bottom or even on the back of an envelope with the stamps untouched, and the other half of the time a postmark doesn't even end up on the envelope at all.
To be fair, the govt has in the past many times looked at both selling and opening up AP letter delivery for competition as Australia had one of the profitable postal systems in the world. Honestly anyone thinking AP is bad needs to travel, its a far more dynamic postal/parcel service than most others.
Howard actually came very close to selling AP, not sure why they stopped.
However today times are very much different. The Letter service is now a financial basket case. $B dollars of sorting equipment is getting less work each week. The volume of letters has plummeted and I think they know as the oldies leave us, the remaining traffic will evaporate quickly. A quick google shows something like ~20% YOY collapse for last 10 years. Basically we are witnessing the end of the mail letter service as humans have known it for the last 200 years and it won't take much longer before it follows the telegram service and folds completely.
So yes, the mail service frequency will continue to decline and outsourcing or opening up to competition won't save it as who would get involved.
Perhaps the tide will reverse on junk mail delivery in that these people will be contracted to deliver mail?
Talking to my dad today, he feels AP will evolve into the general store of the mid 21st century, basically providing a shop front customer service centre for all those govt and banking services that used to exist as those. Maybe even form a general savings bank for small fund customers.
Perhaps letter delivery may be completely abandoned and replaced as a form of parcel, back to your 0-250g size. Get a sms to come pick it up or pay more for home delivery.
Maybe of interest to some but the UAE never had a street mail service partly because the streets had no names until not that long ago, its PO Box only. You can pay a fee and have a PO Box attached to your house. We retain a PO Box into the PO Box tower near the shops, but it gets very little use these days. In 2012 it was hard to get, but I bet today its easy. Mostly all we get is NAB statement (not sure why not online) and may Railway mag subscription outside the limited number of people who bother to send us Christmas cards and birthday cards. Everything else is mostly couriered to our house. Emirates ID and bank cards are only handed over to you in person.