Some traits should either affect all planets in sector (as before 3.8) or there must be a cooldown for assigning a Governor to stop this endless micromanagement hell.
I'll be honest I STILL don't fully understand the logic behind "we want to reduce the number of leaders, so we are going to make it so governors which used to benefit an entire sector will now benefit only one planet at a time".
(EDIT: Governor level can apply to sectors, but traits do not, and there are some GOOD ones, especially leveled up)
But I've also been playing long enough to remember why they removed leader cap and now have to sit here watching in pain as they re-add it.
Anyways, on topic.
If I was making adjustments, bonuses that give a one-off effect and not a passive effect, like "build cost reduction" or "tile block clear reduction" and ESPECIALLY "ship cost reduction" (this can make the fleet manager lie about costs and how many ships can be reinforced) should be councilor traits and NOT planetary (or sector) traits.
Arguably this could also extend to traits that affect things that can fluctuate somewhat. Things like crime reduction, as an example. The best purpose of a "planetary" trait is one that lines up nicely with a planet specialization, like "research bonus" or "mining bonus". This compliments the new system, since those types of bonuses used to be applied sector wide even if the sector had a mix of specialized planets.
The crazy min maxer at it again
To be honest, "Grand Strategy" is sort of deliberately targeting that demographic. And besides that, this isn't really "min/maxing". This is "My governor has a trait that very clearly does absolutely nothing if I have them sitting on a planet that doesn't need to build anything". It's actually kind of a reasonable train of thought.