It's a trust issue. Mozilla burned a lot of it in recent years.

> Mozilla made it clear it will not adopt changes that prevent extensions like uBlock Origin from working.

That's the thing: I don't trust they'll keep good on that promise for more than a year or two. I may be misremembering things, but I'm pretty sure they initially weren't going to adopt MV3 at all, then they weren't going to add DNR, now they're adding DNR but "not removing request blocking, pinky swear". Once DNR lands, I worry they'll start thinking about removing request blocking, under the guise of "security".