You bring on a great insight, about newer stakeholders just voting for the top 20 because, why not they must be the best. No network is perfect, however, there is a threat to blinding voting as we have seen with the hostile takeover, so you should be very keen on each vote you place.
If you hold stake, it is in your best interest to vote for good witnesses, and fewer is better if you don't have the bandwidth to research 20 (you get 30 votes, backups witnesses are critical for the sytems survival, show they love) then make a goal to get to know 1 witness a month, thats not hard at all they all have public profiles you can click and you can even reach out to them directly if you leave a comment.
I think they call that networking Dan; good morning ;)