You can trust your equipment a bit more. Lenses and camera can withstand much more than we dare to think, be it a few water splashes, dust or screwing / unscrewing of filters. As long as a bit caution is involved the threads will do their job for a long time.
I think saturation is better controlled in post-processing as well other parameters (contrast, colour tones etc).
Filters are essential where light or parts of light need to be blocked from getting to the sensor because it is unwanted and cannot be removed later, e.g. stray light (use CPL, Haze filter) or where the total amount of light needs to be controlled (use ND, GND).