There should definitely be an option for users to disable custom themes on a per-magazine basis. I don't mind them, in general, but some themes can be hard on the eyes, and I'd like to be able to easily just toggle it back to my own default setting.

At the very least I wanna see a setting to just disable all that. I didn't mind subreddits having their own themes, but I turned off 95% of them and it was a nice compromise. If people wanna use em and I can turn em off on my side, fine. Don't force me to look at that ugly shit tho lol

One magazine I follow set their background to some busy picture of characters from the game, and it made posts completely unreadable and caused the text menu under comments to disappear.

I hope we get the option not to use magazine cosmetic settings so we can choose to use the default.

There should be an option for you to turn the custom CSS off for yourself, rather than disabling the entire feature for the minority of people who don't like it.

This has been discussed in the kbin matrix channels in the past.
An option to see the default or custom magazine theme is something that will definitely be added.

You can however do some cool stuff with it! (best viewed on a darker theme, or tokyo night :) )

there is a script that can disable magazine customization, but i would never want the option to customize to be taken away, its super fun and different than most sites.

edit: here is the script @Chozo @onyx @EmptyRadar @GeekFTW @stopthatgirl7