The stuff left in Afghanistan were never coming back anyways, mraps, humvees… are in great supply and are actually being replaced with newer models.
Your point on higher tech systems is accurate, but the supply source is far greater in the west than in Russia. As for M-777 specifically I think the supply and reconstituting capabilities are there, M-777 was designed for war with soviets, not really a player in a Chinese conflict so supplies are there, is the will to supply and produce them, always a question
There are plenty of posts on stocks in storage so I won’t post them again, but they are in the thousands.
Western production as well as Ukrainian production are ramping up , Russia is too, but they are not the Soviet Union anymore and production is in the 100s not 10s of thousands.
We will see
C-130s, Blackhawks and other aircraft.....LOTS of smaller arms.... This list isn't just a list of trashed out/deteriorated weapons. But according to you we'd have left it all anyway. I think not, and I don't think the Pentagon planned on that either.
https://fee.org/articles/here-s-the-list-of-billions-in-military-equipment-the-us-left-behind-for-the-taliban/