My issue with not having tier was two things. Firstly, man, I really hated trial of the crusader and that everyone sharing the same armor type looked the same, themed sets or not. The reason people transmog so often to prior tier sets is because it feels thematic to their class. I have no attachment to wearing troll armor lol.
Themes and visuals aside, as soon as they announced there was no more tier sets, I knew that mythic+ was going to replace how people geared up and now we don’t have that cool moment of finally getting the 2 piece or 4 piece together.
Also, not every tier set changed how people played their class but when it did it was interesting for a bit to see how things shifted. The most I’ve had to change my rotation is I now alternate abilities once in a while for streaking stars when I’m so blessed to actually have that trait on the gear I get lol.