Yes, but... the difference, as far as I see it, is that on the one hand, I work hard, earn a special cosmetic reward for clearing some manner of difficult content, and I get to keep that reward forever through transmog. I earned that, no one can take it away from me, and if people missed out on it, that's too bad.
On the other hand, I work hard, earn a special cosmetic reward for clearing some manner of difficult content, and then it goes away later, or is changed into something less than what I initially earned. I earned that, but it was taken away from me, and now what's the difference between me and someone who missed out on it? No one wins in the long run.
That's just my take. The long and short of it is that I'd rather earn a cosmetic reward that I keep forever and that no one else can steamroll and trivialize later, than earn a cosmetic reward that... just no one keeps. Like, what if you could ONLY wear or mog seasonal PVP gear during that season? Or what if the Mage Tower artifact appearances just vanished, even if you did it and earned it? I dunno, maybe there's some fleeting appeal to having content work that way, but I probably won't ever understand it. :/