This game reuse assets too much

[CKNovel]

If something, they should reuse assets a bit more, for example expert roulettes should be something like m+ in wow, so maybe instead doing 13 new dungeons each expansion, they should do 9 dungeons, and each season (7.0 -> 7.2 / 7.2 -> 7.4 / 7.4 -> 8.0) they put in the expert 3 new dungeons and 3 old dungeons reworked for lv100, so you have a pool of 6 dungeons (instead of 2 or 3) and the development time saved can be used to have +1/+2/.../+10 version of each dungeons for example

Yes, I agree with this.
WoW has something like 4 mythic dungeons but there's 4 more from previous expansions that are simply upscaled.

I wish they'd upscale more content, wouldn't it be fun if we had a new savage tier every even patch and an upscaled older savage tier every odd patch balanced around BiS?
And their rewards could simply be the maximum ilvl gear... or mounts, like give me the titan car already.