Sectors utterly fail in the goal of reducing micromanagement because the sector AI cannot optimize planets, it is basically too dumb to play the game. The goal of sectors, however, was not reducing micromanagement - if micromanagement was gone Stellaris would be even less of a game than it is. The goal is artificial difficulty.
This is hardly crippling though since your AI opponents are bound by the same limitations. At least you can use your superior brain to optimize your core worlds. Besides, optimization is pretty damn different from "immersion" which the OP claimed was destroyed by sectors. In my opinion sectors increase immersion since you really can't micromanage a sprawling galactic empire.
- 3