Welcome to the forum
I'm glad to be able to tell you: You're not a mad man at all! Shield management is actually a central part of advanced piloting in Sector, the game even has many mechanics in place that encourage you to turn of your shields.
- Shared flux pool: As you noticed, weapons and shields share the same resource. Which means you can greatly enhance your offensive/defensive potential by focusing on one of the aspects.
- Constant flux generation: Activated shields always produce flux, just not quite as much as you dissipate naturally. But your rate of dissipation is lowered. If, for example, you dissipate 300flux/s and have shield up keep cost of 100flux/s you will only dissipate 200flux/s with shields up, effectively reducing how much you can fire.
- 0-flux speed boost: Your ship is faster when it is not producing any flux. So if you want to travel fast, lower shields (and maybe silence weapons with "x").
- Damage types: Kinetic damage is does double damage against shields, but only half against armor. So it's usually safer to turn of shields when under kinetic fire on concentrate on your offense.
-Shields make you a bigger target, you can evade some shots by turning them off
So, in conclusion, shields are extremely
situational. Learning when to activate and deactivate them, and being able to quickly switch between the two states, is the mark of a good player