They’re all just having fun. Playing with and justifying to tax payers a need for their expensive fun equipment. Remember the “peace Dividend” USA and USSR tax payers were supposed to get? After USSR went bankrupt before we did? With that so called Arms Race to the bottom? It never happened. Russia kept on wasting money, and so did the USA.
I also figured back then without Russia as a fake enemy rival (everything is fake these days, including the economy) I suspected China would be the new fake enemy, like fake news. And lets face it. How many different shapes and types do we need for fighter jet aircraft? They need to standardize that.