Yes all those T90s and Armatas are just for fun, but we will convince ourselves otherwise because it suits the people in charge, both civil and military to do so. We really really do seem to be copying the early 30's at present in most unsettling ways.
There also seems to be a developing theory that the military only exists for choice - not for the balance of hard and soft power.
There is also a growing theory that automation and cyber will render future competition bloodless. The people that subscribe to that theory don’t understand influence and coercion