You specifically called out PoEs passive tree, but honestly the tree isn’t the crazy complicated part of making builds–its finding combinations of mechanics that synergize above average. On the tree sure, but the gear and actual skills are really what makes it crazy. Planning around what items can have what mods and what you can reasonably expect to get on what budget is the real brain disabler for me. I love build crafting, but fuck I hate planning rare tier gear.
Towards the end of the decade Total Annihilation would be released and it’s modern day fan made remake, Beyond All Reason, is really good. Sad there’s no campaign though, I really loved the TA campaign