The only way around the dystopia this will lead to is to constantly and relentlessly shame and even harass all those involved in helping create it. The scolding in the issue tracker of that wretched "project" shall flow like a river, until the spirit of those pursuing it breaks, and the effort is disbanded.
And once the corporate hydra has regrown its head, repeat. Hopefully, enough practise makes those fighting the dystopia effective enough to one day topple over sponsoring and enabling organisations as a whole, instead of only their little initiatives leading down that path.
Not a pretty thing, but necessary.
Ben Wiser ( https://benwiser.com ) turned off comments altogether.
for a personal blog it has quite a lot of PR speak
Consider incentives from Google's standpoint. They want to provide users a safe and secure experience. They want to simplify maintenance of software and provide developers the ability to simplify maintenance of software (a problem simplified by chopping the unbounded set of possible user agents down to a blessed, vetted subset). They have the resources to make their site screen-reader compatible, so they're not concerned about damage that could be done to screen-readers because they'll just bless one and support it. And, of course, they implicitly trust themselves to do all this.
In that ecosystem, Weiss's viewpoint is completely reasonable. The old model of the web is old, and led to gestures broadly at all the bad things about the web today... fraud, users getting owned, CP, botnets, misinformation factories. I can definitely see the viewpoint where someone concludes "It's time for a new model, and this company has the resources to do it."
I don't agree with him (and in fact I think the idea will fail; I think Google actually overestimates its ability to provide an equivalently-good user experience to what we have now if they aren't leveraging the unpaid labor of other vendors putting the effort into making their own houses work with Google's house without Google even being aware of their work). But I think it's useful to wrap our heads around how one gets into that headspace without thinking oneself a monster.
Nothing in the proposal requires the third party be Google. The proposal does decrease the control the user has over their own hardware, in the sense that it provides a channel for a site to decide the user-agent / hardware stack is the wrong pedigree to serve; that's not universally considered evil either (few people really get bent out of shape that you need a Nintendo Switch to use Nintendo Switch Online services).