If you're happy with the ROM as it is, there's no need to mod just for the sake of modding. Plus, you'll have less issues or other unexpected behavior. Keep it simple, keep it clean.I am using lineageos without root and wondering if there is any good mod for lineageos 18.1 or leave it as it is and add nothing Thank you very much, I'm glad if you guys share these cool mods for this great rom.
I personally just use Magisk for AdAway and Vanced, but there are alternatives (AdGuard, non-root Vanced). I guess old habits die hard, so I stick with these as I've been using them for years.
In general though, I don't see much point in rooting, installing custom kernels, etc these days.