just another dev

That would put still allow the instance admin to oversee all your different accounts - which would require giving a lot of trust to just ‘some stranger on the internet’. Wouldn’t you be better off just creating different accounts on different servers? Then the only person that knows those accounts belong to 1 person would be you.

Edit: one thing I would welcome is the ability to hide your public profile, or posts on a specific community. Then again, all the info is distributed, so it would just take one client to gather all a users posts, tie them together, and expose it anyway.

So while on one hand I understand your wish for anonimity, in practice it does more harm than good. You might have good reasons to do so, it would also allow people with less aligned intentions to sway public opinion, or make certain opinions seem more numerous than they are. I don’t think the downsides are worth it.

As little as possible. For me, less content to scroll through is a feature, not a bug.