Not a bad idea, but I don't think it should be so direct as that. Hopefully one day we'll have way more guardian modules; I'd prefer it if they formed a circle of sorts.
So something like, the Guardian Powerplant gives +5% speed or something.
They really aren't. They're just different.
Human hull reinforcements give more hull, true, but they also take longer to repair. Meanwhile, Guardian Hull Reinforcements are lighter and also increase the integrity of your modules against thargoid attacks(the main thargoid cannon does caustic damage, and resists benefit modules too).
If you take into account more durable modules, the guardian hull reinforcements are basically just as good as human ones. If you account for faster/better repairs, too, the guardian ones are outright superior in some cases.
But all people wanna look at is 'numbers big', so nobody pays attention to this.