I think we don't actually disagree and I was just not precise enough in my original post.

What I described above applies to abilities that are relevant in combat and any other type of encounter that the respective system mechanically treats as a conflict similar to combat. That absolutely does not mean other abilities should not exist, just that they should not be practically usable during an ongoing combat-like short term conflict.

Also: Abilities that are useful in short term combat-like conflicts and abilities that are not should not compete for mechanical resources of any kind, that is never fun.