May the lore be great and the stories interesting. A game without a story, is a game without a soul. Value the lore and it will reward you with fun!
Don't let yourself be satisfied with what you expect and what you seem as obvious. Ask for something good, surprising and better. Your own standards ends up being other peoples standard.
Different opinions are different.
Having each zone be self-contained makes it much easier to have large storylines, not to mention each zone sets up the lore behind a dungeons in the penultimate quest.
With zones being self contained you don't have to worry about how each character fits into the entire story, just their own small part of it.
Not to mention the overarching goal for legion questing is to gather the pillars of creation, they are already conntected, and as a leader of your class order, you decide which area needs attention first.
And to not forget that having four start zones decreases the problems of past xpacs when you only had one or two start zones, and the traffic jams that it caused.. Everyone should remember the problems people had at the initial start zone in MoP, and the same with WoD..
Actually I don't know if you actually played the beta but if you stay in the same zone when you level, everything stays at the level it was for a couple hours or unless you leave the zone for too long.
I forget the exact triggers they outlined in a blue post, but for the most part it preserves that feeling of overpowering it a bit before you move on to the next zone in practice when I was playing it.
Ilvl does not sync, I can roflstomp everything except for full party bosses at ilvl856 which is basically Mythic Dungeon gear with legendary and couple of lucky pieces