That's incredibly naive. Only a tiny fraction of people who don't like it will complain. Others will just switch to another browser. And most will probably put up with it. And if that happens once, it might not hurt you too much. But when you do something like that over and over, you are going to bleed users, including the ones who initially put up with it as the list of things they don't like piles up.
> People don’t use Firefox because of add-ons. Our telemetry shows 80% of users never install any add-ons
Uh huh. You know why I started using Firefox over a decade ago? Because of addons. And as has been mentioned before, a lot of users disable telemetry, especially power users who are likely to install addons. So how reliable is that telemetry? And how many Firefox users are only using it on the recommendation of a friend relative or IT specialist that does use plugins.
I'm not optimistic for the future of browsers. I still prefer Firefox to chrome, but I'm not happy with the direction things are headed.
One final thought. Here's an idea for getting some funding independent of search engines: a Kickstarter like program for users to pay to get some of these features back. Though on second thought, maybe that would give Mozilla even more incentives to rip stuff out...