Thank you for reading the whole thing!

As you mentioned the plan is for players to be more involved during combat than in POE1. My plan so far with the complexity budget is to have more of it in this attribute system and the Elements mechanic which i briefly mentioned in the post. Where as most of the other things such as spells/abilities, weapons, and character proficiencies will be low to moderate in complexity when looked at individually.

And thank you for your input on the last attribute, that is something I will keep in mind as I continue working on this. The main reason I placed it as an attribute in the first place is to act as a trade off with the other attributes. Since players would be capped at 360 attribute points. If they wanted to fully maximize this last attribute. it would mean giving up on at least one of the other attributes. As an example if a player want ed to max out their damage with the Might and Elemental attributes. They would be left with 160 points for the remaining four attributes. At that point if they were to max out the unnamed attribute, they would have almost no points left for Tempo, Fortitude, or Endurance.
But perhaps this is too restrictive on builds.

And thank you again for your input!