How would you improve YouTube comments?

Political science has plenty of literature about sophisticated voting systems (vs the simpler systems in general use today): there one can find a good part of the theoretical background. (I am focusing here on the feedback as fundamental to the goal.)

An example: Numbers Rule: The Vexing Mathematics of Democracy, from Plato to the Present by George Szpiro is a primer.

Of course it depends on the goal defining "improvement" - heuristics, informative/insightful/funny, educational, sinister goals (compulsion, sensationalism etc.).

For example, votes should be clustered and weighted (the Professor has more more insight than the Child - so "weighted" - in some areas - so "clustered").

Also: technically, that platform should be heavily modified to allow for fruitful discussion.

There should be a trigger mechanism that recognizes the type of spam seen, for example, following Twosetviolin posts. There is a specific person who can only barely play piano that posts his songs in every comment thread, even though his links are clearly attempting to derail every conversation in these threads.

It should be super easy for YouTube to notice this link over and over and over again in the comments for a single video. There isn't a case where this would be acceptable behaviour, so why not sense it and end it? It is the definition of spam.

Use the same systems as HN: down voted comments disappear, getting down voted stops you commenting, new users are rate limited as are replied on the same thread.

Ban stupid comments such as "FIRST!!!" or similar shitposts.