I hope the Writing doesn't remain like it did from Post 5.0 to Now (post 6.0)

[Iscah]

I wouldn't mind so much if there was some unprecedented world-changing event as an explanation for all the brand new science. Some reason that the impossible became so easy in this era. Not just the same group of prodigious youths bulldozing through scientific barriers whenever something inconveniences them because they are so smart.

We went to a world that did go through an unprecedented world-changing event (the Flood) and observed things there that were applicable to the concept of tempering. That was the catalyst to investigate multiple other threads of possibility that hadn't been pulled together before, assisted by the work of other researchers.

I feel like they ended the ascian story and now we are getting Zero fanservice and I am not a fan.

Yes, they did end the Ascian story and now Zero is the focus character of this "wrapping up loose ends" arc. Whether you like her or not, you can't say it's bad writing to give the main character of the story arc a lot of screentime.

The game goes through phases. You'll like some and dislike other. Just wait for the next story arc to get started. Personally I disliked Stormblood and had preferred Heavensward, and so it felt like the game was on a downwards trajectory when I first got to the then-end of the MSQ around patch 4.1, but looking back there from two expansions later, and it's just low point between other story arcs that I got more enjoyment from.