I feel bad for OP, investing such effort in a heartfelt expression of disappointment in the direction the game has taken... wrong forum mate, people have a compulsion to defend every design choice the devs make no matter what. Of course they liked having control of sectors before... but the holy scripture has changed, and so must the zealots.
The player base of Stellaris will diminish with this update, not sure if the devs wanted this to happen but it’s what’s going to happen anyway. Poor design choices - not for everyone, but for a lot of long-standing fans, the game has changed dramatically, and the game flow and total experience is completely different compared to, say, 6 months ago, or a year. To each his own, as always. But on this forum, design choices are sacrosanct. You can expect a united front only for bugs.