You disagree with a point I never made. My point is that they enable easier memory management, regardless of whether they're more performant. I really don't understand how that point didn't get across. You must simply not have read what you responded to.
You said
> I think it should be preferred wherever it's an option for that reason most of all.
And that’s far too broad in my opinion.
Sure, if you’re writing in a language that makes memory management difficult, like C or Zig, that might be worth it, but arena allocators apply to many other languages too.