funny thing: when was the last time a major tank battle happened
between forces of equal technology?
Even 73-easting was a battle involving a twenty-some-odd year difference in tech levels, to get to a situation where the tech is comparable, you have to go all the way back to the iran/iraq war of the 1980s.
and even there, it's not really a comparable matchup because you had a huge spread of capability (era wise)
on both sides.
the 'obsolete steel' armor is still relevant and effective, given the likely opponents-why? because a top-down hit (or bottom up, as in the case with popular IED designs current to the present era) will still kill an
Abrams.
which is pretty much the toughest armored vee out there, and yet, some of the 'improvised' adaptations (Slat armor, etc.) seem to narrow the field of 'effective anti-armor' weapons even when applied to third-hand surplus T-55s, Centurions, and the like.
The Perfect is the bane of the good enough. An upgraded, up-gunned M-60 is probably more than enough tank for facing anyone but the U.S. army, because even the U.S Army faces things that kill its
best tanks handily at a fraction of the cost-but those are much narrower choices-fewer options that work, see?
OTOH, the old Patton design is relatively fuel efficient (compared to turbine powered vehicles) and has a decent amount of armor against the most
probable opposition. Moreso if you improve the secondary protection systems, or update the armor (Magach being a good example here).
Since World War Two, with very few exceptions, the winner of a tank-on-tank is going to be the guy who gets his shot off first. Tank-on-infantry has
always been questionable. There were Technicals killing tanks with early wire-guided missiles, recoilless rifles, etc etc. since 1948, the cold war for a while thought Tanks would become obsolete with the invention and proliferation of shaped charges and missiles-and yet, theyr'e still a relevant force on the battlefield, while tank-busting helicopters have become somewhat
less of a replacement with the proliferation of good AA shoulder fired missiles, better field detection, and improved AAA systems.
In considering all out war scenarios, it's kind of important to remember that teh top-tier powers are pretty averse to dying, which means they're not going to (voluntarily) go to the point of pulling out the stops WWII style-which means matchups are going to be first-tier powers against third tier, or two third tier powers going at it client-style.
because nobody wants to be extinct.as for 'obsolescence' being a factor let me remind you of something...
and
were still plenty effective in 1973, even up against
a tank that was 20 years newer at the time, with a significantly better armoring and hull, and with guided antitank missile support.
strategy and tactics still matter more than raw technology.