Then 3 months later they hop over to a new startup and never have to maintain any of it.
Which is not to say that web front end didn’t have problems before. It needs to change to stay relevant and there were and are gaping holes in it. But I don’t see in most of this a steady or sustainable evolution of a platform that must remain backward compatible, transparent, and approachable to maintain the qualities that propelled it to success. I see a bunch of cargo cultists overengineering in an effort to show off how they could have built a better platform if only someone had asked them when they were toddlers.
And people criticized Flash for all sorts of good reasons. It distracted from real needs and real solutions and was basically an offshoot of the browser wars where a third party vendor tried to hijack all the browsers. ActionScript was great, but proprietary platforms that required technophobic users to install plugins they didn’t understand was never going to work for a number of reasons.
The web succeeded thanks to view source and open standards. Why does everyone seem determined to forget that?