While I agree with most of your points, I don't want Firefox to implement uBlock Origin.
Should Firefox prioritize compatibility with it? Yes. Should the uBlock Origin developers have the personal cell phone of Mozilla's CTO? Also yes. But there's nothing to be gained from absorbing it, and all we'll get is more bureaucracy.
If anything, I'd like Firefox to focus more on their core product, not less.
My argument is that Firefox should have functionality equivalent to uBlock Origin by default, so that less tech-savvy users who install the "privacy" focused browser actually get some without having to browse for extra add-ons and potentially install an inferior or outright malicious option.
That'll cause Firefox to get blacklisted by a large number of websites.
It doesn't take much for a website to determine that the Firefox user agent (or detectable fingerprint) results in zero advertising ROI. They'll block it outright and ask you to use Chrome.
Should Firefox prioritize compatibility with it? Yes. Should the uBlock Origin developers have the personal cell phone of Mozilla's CTO? Also yes. But there's nothing to be gained from absorbing it, and all we'll get is more bureaucracy.
If anything, I'd like Firefox to focus more on their core product, not less.