I would really want to understand comparator priming and all other redstone behaviours. If tile updates were shown visually it would be A LOT easier.

There was mod for 1.12.2 that allowed this (and I believe part of technical community is already familiar with EDDxample)
https://www.youtube.com/watch?v=kWRAZjuRFjs

Okay, I found Fabric mod for this:

(asked EDDxample, and Space Walker replied)

https://modrinth.com/mod/redstonetweaks