Second of all, this should be treated as good news for the HN crowd: Google is transitioning from a proprietary, Chrome-only app model to the open-standard, PWA model. Who doesn't support that?
There are a bunch of "typical Google cancelling a product" comments here. But for real, I simply cannot imagine any Chrome app which people actually use, whose developer is not going to transition to PWA and gain a bigger market.
Seriously, this is like complaining that Microsoft Edge doesn't support ActiveX controls. (And I certainly don't recall any complaints about that here.)
This is good news, people. Less fragmentation and more open standards.