I remember seeing a meme a while ago, "What mod adds ____? Its Quark its fucking Quark" I couldnt find it but that should show how large of a mod quark is.
Quark is the epitome of a bloated "QoL" mod that people who dont know better install, then have to spend 5-10 hours troubleshooting, debugging, and configuring the completely random additions of quark, with the additions themselves being very poorly communicated in game.
Quark also doesn't describe the features it adds on its mod page, again leading to people jumping to reddit to ask questions about the mod of mods.
I also also talk about Zeta, the library for Quark 1.21.1 and 1.20.1 only. Zeta has 12.3 Million downloads, despite being pretty new. Zeta adds nothing to Quark or otherwise. Its many undocumented files and mearly wrappers for the existing vanilla files. Ex: ZetaFenceBlock extends FenceBlock, and ZetaFenceBlock is 5 lines of new content. Those downloads give them a nice chunk of change for basically nothing. But dont worry! They also proudly advertise their patreon and fucking tshirts on every mod page.
I suggest installing Quark as way to discover a specific feature, then to uninstall the bloated trash and find a single mod that does that feature you want.