It wouldn’t. Why the hell can’t I (or someone) randomly stumble on some post by choosing show me local (server) content feed or by choosing show me all, or simply by search and then vote up/down the post or comment even if I’m not right now in that particular comunity. E.g. if someone posts perfect or simply wrong misguiding bulshit reply, or then I find the post very usefull, or then comment is funny or on a contrary it’s not. People are not living in a boxes of closely guarded comunities without exploring whats outside or new, without migrating, joining, leaving, fighting, agreeing, cheering, checking what ather users are into, etc…
And to add the second counter(s), technicaly is just as a simple as adding one aditional db field on posts table (or two if we keep ups and downs totals as separate fields now). And after, adding a simple if clause near the existing ones caunting global likes/dislikes, to increase a comunity counter too if this particular vote request comes from comunity member. Thats it. Then you can start expanding sorting options to enable more sorting options, but thats even not nesesary at first. Quite enough it would be simply to output vote count as a text at the top of post, near the global total - to be able to see what comunity members think and to be able to compare to what outsiders think.
From the readers standpoint – do anybody realy care if poster have checked votes he got on a post? Who of the readers care? That is only a posters problem or advantage that his post missed or hit readers likings. Him checking it or not is not taking care about readers, but taking care about his next posts popularity at most. As for mods discusions on readers convenience - maybe they are happening on some other verse, where readers (here on lemmynsfw) are not asked or taken into account by giving a vote. If I’m wrong, corect me by pointing to such public discusion with public votes.
On openess of mods, well … … by me, the lemmynsfw admins, contrary to your saying, did the oposite of trying something new. They tried the same old – lets limit users abilities, lets limit expression of opinions, lets remove downvotes. And the argument is as old as earth – we will make some of you “feel” more secure, let the snowflakes rule it all (at the cost of less freedom of opinions). History of encroaching enshitification is repeating, but now its here, perfectly federatedly distributed oh the irony one. I do not like the smell of that.