Hi there,
The impact should be minimal but we do recommend only activating the modules you use to optimize the performance.
If I am utilizing a module to customize the theme, what happens if I disable that module? Do I lose the customizations that I made permanently or only temporarily while it’s disabled or not at all?
It would be temporarily until you activate the module back.
What if I uninstall the premium plugin altogether? Do I lose the customizations that I made permanently or only temporarily while it’s removed or not at all?
Same as above, temporarily until you re-activate GP Premium.
Let me know if this helps 🙂