If running Chromium is no longer viable, and the web increasingly doesn’t work on Firefox, then for the first time in the web’s history, we don’t have an open-source browser. The web becomes proprietary tech owned by Google. Just let that sink in.
I have been using Firefox as my daily driver for years now and I can assure you the web works perfectly fine. I can't remember the last time I came across a website that was even slightly broken on Firefox and worked on Chrome.
Quote from your link Nov 1, 2019
I use both Firefox and Chromium on ppc64le because only Chromium has a working JIT compiler through IBM's V8 port. I don't use sync or any of Google's services, because I'm just not interested.
Talking about dropping Chromium entirely over it feels like either an overreaction or a political move to try and get Google to acquiesce.