I'll concede the first point.
Second happens every few expansions. No other time has there been anywhere near as many design cuts, as well - which is the sole reason they were able to do such a large shift this time around. Certainly nothing great came of it (Except possibly SPriest, Ele, and Balance).
Same thing, different approach.
I'll definitely say NH was outstanding, and by far my favorite raid of the expansion. My opinion on ABT isn't quite the same, but it's far from bad. That said, neither is anything "new" to the table, really.
M+ I mentioned.
Artifact challenges I will also concede. Was much harder and more fulfilling on release, too. Had they been kept to that point and Legiondaries never existed, they would've been my highlight of Legion.
DH is alright, I mained it off the bat for a while, but the lack of developer attention to crippling issues (RNG on RNG on RNG on RNG on RNG in performance output and rotation flow, PTR change introductions only to rip them away as live updates come repeatedly, etc) killed the class off before it got far. Also doesn't help that both Havoc and Vengeance are some of the most barebones specs in the game, atm.
Cinematics aren't anything special or crazy new.
Voice acting, again, I'll concede. I really like it myself.
So, of the 9 mentions, 3 are relevant to additions that Legion brought.
Just not much to really add on to it. For the most part, Legion was more of the same (Except class design, for whatever reason
), and things only seek to get worse come BfA on the matter of adding onto the game, rather than taking away.