Even that, doing it too much will increase rendering work. Which may tank performance on low power computers or those with big modpacks.

Just fill in every hole like a big boy

I man, a single torch solves this issue.

baby zombies also small slimes if it's a slime chunk patch up every layer

I'd rather zombies in a sealed pit contributing to the spawn cap than zombies where they can wreck my shit

I'm unbelievably lazy and this is what I do. Torch on every surface and then a patch of grass. Never had a problem.

I give people playing Minecraft with me the same warning I give my partners.

This is a blanket warning that everything I build on is chaotic in the same way my mind is, and any time you spend in my sandbox is time you spend rolling the dice on a fun new disaster.