How frowned upon is it to add mods to modpacks?

Cuz I'm currently playing Beyond Depths and I really want to add in Botania, Witchery, and Immersive Engineering at the very least. Probably also Ars Neuvou, Occultism, and Mekanism. Just so I have a few mods in here aside from Create that are familiar to me lol

Legit it advertises itself on "Over 400 mods!" but 90% of those mods just make the game look prettier or add new structures/dimensions/bosses. Which, nothing wrong with that, it is a very pretty modpack and very well-designed as an exploration and boss fighting pack. I just miss some of my automation stuff that I'm more familiar with.