I thought they took care of quests blocking each other issue by letting player pause quests. I still got location blocked at the start of Archon quest by Neuvi's open quest and then later character blocked due to Wrioth's open quest. I am not seeing any option to pause the other character quests.
I actually don't know how this system works. From my limited experience, I don't think it stops it from happening or maybe doesn't allow a pause, but it will pop up a message when you go to start the quest that tells you which quests would prevent it. I've seen that much at least.
Also, in other news, I can't believe I'm saying this, but that new giant hydro Eidolon boss is actually pretty damn challenging for an ascension material farm boss. Several moves that do 10k+ damage, instant teleports across stage, a "don't let him succ his buddies" mechanic, "floor is lava" circles to dodge. Worse of all, I never really realized how much I lean on my Hydro characters, which are useless in that fight.
I can manage with my Eula team without too much trouble (especially if I get a crit on her burst at the beginning), but I had Shogun get 1 shotted by one if his moves at some point and she has 19k health.
inb4 "Just use your Zhongli bro" which I'm sure would trivialize it.
Anyways, I'm quite happy to see them adding something to push your balls in a bit. Between those new fatui girls that can follow you halfway across the map and basically have Keqing's move to insta-teleport to you, and the consecrated beasts (that everyone but me hates), I'm enjoying this overall increase of general combat difficulty.