I'm all for criticizing the new episodes but you got like half of this wrong, including the "dumbest explanation of what happened to the island". Maybe it's best to wait until you can actually read something before making such declarations?
I'm not too worried about how fleshed out things will be, or about the small moments. The first letter, from the editorial department, made mention of his talks with his team. While Mori said he won't be fleshing anything out himself or going beyond what Miura told him, he never said anything...
Whoops. Tsuzuku being written like that was an error on my part. Tsuzuku is written normally with the addition of 次回 . Honestly don't even remember how I messed it up, haha.