As i progress in ultimate, i see that some dot damage types are more supported than others. For example poison is supported from lots of skills, devotions and legendaries in contrast to chaos damage. Aside from chaos, elemental damage is also less supported (such as from skills,devotions, etc.) than others.
What i said is valid for also resistance items. Chaos again is less supported…
This game needs to provide equal amount of items and skills and devotions for all types of damage.
Elemental damage is very well supported.
There is more to it: some skills are supported so well that you can get to ultimate rank accidentally, while for others its almost non-feasible to reach it at all. I take it its difficult to cover everything with the number of damage types and this skill system. There are some 200+ legendaries in the game and they only barely cover everyone’s needs.
I agree with this as well. I have brought up the lack of synergies(support) with chaos damage before as well. I have also noticed primarily in the devotions that Elemental Damage is not supported well at all. I will say this before the counter-argument comes up, individual elemental damage type support is not the same.
here’s to leaving room for new masteries to be added 
Chaos damage, in my view, needs more itemization and constellation support.
But then again, there aren’t many pure chaos skills out there.