Many people in silicon valley truly Believe that AI will take over everything. Therefore, this is the last chance to get in so you better be working really really hard.

There's a palpable desperation that makes this wave different from mobile or cloud. It's not about making things better so much as its about not being left behind.

I'm not sure of the reason for this shift. It has a lot of overlap with the grindset culture you see on Twitter where people caution against taking breaks because your (mostly imaginary) competition may catch up with you.