Overlooked with all the rhetoric, 44's etc are near 60 years old, the crap thats come since haven't got a hope in hell of lasting that long, totally different build ethos back then, and a classic case for the KISS principle (Keep It Simple Stupid), the no tech loco's will at least attempt to keep going when things go wrong, everything built since gives up.
I'm sure your theory carries weight in your own mind, but hows about you go tell the companies who are buying new motive power that. You think they're going to slap their forehead and say "oh, of course these new locos we're buying won't last sixty years. How silly of us. Better go refurbish the 44's and lash 'em up to please the train buffs". People need to pull their head out of their backsides and see the economic reality. It doesn't matter if the new locos won't last sixty years, they will last as long as the company needs them to last, at which point they will be replaced.
The important thing to remember here is the locos have not just lasted sixty years off their original construction. They've lasted sixty years because they've been forced to last for sixty years. They're always out of service getting repairs or work done, but they keep fixing them and forcing them back into service. They would have died a long time ago without money and plenty of repairs.
People can come up with whatever silly reasoning they want, old locos should have been scrapped years ago. Make the most of them whilst they're out, rather than coming up with "theories" as to why they'll stick around.