Capability and practicality are distinct concepts. Especially since it's fairly well known that Chrome will not align 100% with Chromium thanks to closed source

Capability and practicality are distinct concepts. Especially since it's fairly well known that Chrome will not align 100% with Chromium thanks to closed source additions and modifications, so it becomes a question of "what is different" instead of "are they different". It's certainly not practical for me, when I can just avoid chrome for personal usage (and I'm thankful for the capability). Of course, I can't avoid it entirely, thanks to my company deciding that Chrome is the only supported browser for our product. So even though FLoC is a non-issue for me personally, it is still something I need to worry about professionally.