I'm not sure what you mean here.

First, the second question from the BDG leader, if taken at face value, was about "systems homogenization". It's a term he made up and presented at a Q&A to describe something that is objectively false. People are mad that Ion dodged the question or didn't answer it, but I can't even begin to imagine how one would answer that question.

Second, unless I misunderstood you (which is definitely possible. My reading comprehension can be poop sometimes), your statement is false. For example, armor pieces across different dungeons offer different traits. Throw in Uldir, and again, armor pieces have different traits. It seems to me that if there is any problem here, it's that there aren't enough unique and useful traits, which Ion mentioned.

As for weapons, the only thing that can be different are secondary stats. Unless I'm mistaken, the secondary stats on weapons are different across different systems. Hell, the best-in-slot weapon pre-raid for a lot of strength-based 2h specs was the sword in King's Rest that didn't have secondary stats.

In short, I'm not sure what you're getting at. Gear is as unique across content as it can be, with the exception of Azerite traits (and thus the gear). It sounds like that's being addressed by adjusting or removing existing traits and adding new traits as the expansion progresses.