The thing with Firefox is that while you're absolutely right on all your points, it's the only mainstream browser that at least tries to care for your privacy, much more so than the current big players, and something that has the best chance of having computer "normies" switch to. You won't get them onto LibreWolf, Ungoogled Chromium, IceCat, Mullvad Browser, not in mass. If you push everyone to one of those super privacy browsers where pages may not load correctly and they're generally more clunky, then that's just turning them further to stick with what they know, Chrome/Edge.

I don't like touting companies, but at least for the current time I still recommend Firefox for those wanting to switch, and later on if they really care about privacy then a switch to LibreWolf isn't as jarring.