I might be out of date with my info here, but additive crit damage and additive damage are exactly the same. However, the difference is in the quantity of the stat. So crit damage on tempered gear is i think 125% base perfect roll, while summoning damage is I think 90%… if those numbers are wrong it doesn’t matter, as crit is always more then summon damage. Now you could go golem damage, but then your mages get nothing… and vise versa.
Given every build is a 100% crit chance build crit damage is almost always the best option as it applies to all your minions and is more then other rolls can be.
Do you absolutely have to use crit damage? yes if you want your char to use the most efficent tempers, no if you don’t really care… I haven’t tempered crit damage and I can do T4 easily, but then again I can only just do Pit 91, working on 92.
So if u want a pit 100 char you need to stick to the absolute meta and be as efficient as possible.