Just give us for each planet the ability to set the focus(es) -- checkboxes for minerals, energy, food, research, consumer goods, alloy, trade or strategic resources. Also give us the ability we had before to set how much minerals/energy they withhold for their own development. But make these options in the planet interface. Lastly, we make it so planets with no tile blockers, no governor and energy reserves will hire their own governor automatically. With governors now only governing just a single planet we may need to buff them to make them worth their upkeep, but that's certainly doable.
Once all this is done, Then we can remove sectors entirely. And maybe we can give technology the F4 hotkey again.