They really need to start doing something about locking ascension materials behind tons of quests.
Imagine being a new player, you pull yae, she's useful for awhile, and then suddenly you can't progress her anymore (and even becomes a burden if you ascend WL too far), because you have to beat mondstadt, beat liyue, travel to inazuma, open it up, gain access to enkanomiya, and finally beat enkanomiya...it's honestly ridiculous and we're only at 2.5.
What happens at 5.5? Beat sumeru, beat fontaine, and do a whole bunch of shit in natlan before you can properly use the character you just pulled?