Well, some of the "old school" has left the market of natural causes since the 2000s.
That only leaves the rest of 'em. Wer dey go, and what are your top 3 reasons for how the values of the 2000s era failed to transmit to the next generation of developers?
Perhaps the math will change if the hardware market stagnates and people are keeping computers and phones for 10 years. Perhaps it will even become a product differentiator again. Perhaps I'm delusional :).