Because there are other options like switching off one tab when you start video in another tab, overlay if you scroll down, default quality (I have to be on 144p because of bandwidth constraints)
As a website YouTube probably doesn't have much interest in working on client-based tools, especially not for a niche audience. Though I do wish they would at least give even logged-in users a way to block channels.
There are browser add-ons that can block channels or certain keywords:
I deal with this by using the Chrome extension "YouTube Options" [1]. It takes a bit to setup, but it works pretty well by filtering out various fluff crap like comments, increasing the video size etc.
P.S. But we should all switch to PeerTube or a similar effort eventually.
1 - https://addons.mozilla.org/en-US/firefox/addon/youtube-class...
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