[X] My Assistant

I think treating generic non-artist galleries the same way misc is treated could possibly help, or just flat out include them in the misc description. I think artist image sets have their place and can help people discover new artist, I know I’ve found at least a few pixiv artist I like from imagesets.

As more artists move to Fanbox/Patreon/etc, having a category for those contents becomes increasingly necessary.
With that in mind, Big Tits Gallery 4 is fucking bullshit that is almost always downscaled booru galleries that don't get dealt with because image sets can't be superior or inferior.
This is compounded by having a significantly less robust tag system that boorus are better at handling anyway, such as actually tagging artists on a per-image basis.
Update restrictions on imagesets should be better enforced, but the restrictions as a whole should be lightened (the 30-day rule has numerous exceptions that make it difficult to apply to anything that isn't blatantly low quality). I would say 14 days, but I don't know enough to make an educated suggestion about the specifics here.

Public artist gallery: significantly reduce incentive because of how trivial it is to flood sections by ripping from Pixiv. There's merit to archiving deletion-prone artists, even then I believe there is much less merit than translating/scanning/etc.
Paywalled: no reason to discourage other than fake updates. Lots of clerical headache if it's separated into a new category, I would hope that an additional imageset misc tag (paid content?) would add sufficient visibility for the same reason that translated:english does in doujin/manga.
Non-specific artist/booru copy/etc: remove entirely, fuck those guys.

...
Paywalled: no reason to discourage other than fake updates. Lots of clerical headache if it's separated into a new category, I would hope that an additional imageset misc tag (paid content?) would add sufficient visibility for the same reason that translated:english does in doujin/manga.
Non-specific artist/booru copy/etc: remove entirely, fuck those guys.

A big concern I can see on any kind of "paid content" tag, as well as rewarding paid and non paid artist sets differently, is that it's very subject to change. Artists (especially patreons), release stuff that's paywalled all the time, before releasing it for free later down the line.

I wholly think generic image sets, like the booru-esque ones you've mentioned and I've mentioned in a previous post, should be penalised in some form.

I don't think any particular exceptions need to be made for artist-specific imagesets.
They are already set apart from imagesets (and other galleries) by the fact that they can be continuously updated (within reason).

People do appear to value these imagesets over others, but I think that a general penalty on all imagesets is offset by the fact that they can essentially be bumped consistently, assuming that the artist is somewhat active.

(I actually don't think that the casual viewer cares whether or not it's a creator or even themed imageset, but I don't have the numbers to justify that at the moment)