Exactly this. Forcing players to grind endlessly to experiment with different mods is evil.I really think we should be able to remove mods, just like modules on ships. The permanency of these mods right now means that I'm going to google the meta builds, grind for that, and then never touch it again. If you allow us to remove things and 'mix and match,' then I'm definitely going to be inclined to unlock more mods and experiment (assuming the grind isn't insane, which it feels like currently). By locking us into permanent mods, there's no way I'm going to do any fun stuff, because I'll feel like I'm just wasting my time unless it's the meta.
My google fu is not strong enough to find those "meta builds" though. Plus, I suspect there will be different "best builds" for different jobs. Stealth missions, for example might benefit greatly from noise suppression and quieter footsteps... while those mods would be pointless for ground massacres.