Thanks a lot for your honest feedback!
First of all, I am using ND/PL-Filters which means, that the image gets darker (ND) plus circular polarized (PL).
I'd say especially for video, they make a massive difference (NDs). This is because I'm filming at 2.7K and 24fps with 1/50 shutter speed for the cinematic and natural motion blur.
The polarizing function depends on the sun's angle to your shot. But when applied correctly (90 degrees to the sun) the effect gets really good, colors pop better and this can't be done in post processing. If you're just taking stills and don't care too much about polarizing filters, you'll not need them i think.
I'm using ND and CPL Filters for my landscape photography also. I hope I could help you, but there are already a lot good youtube videos with good explanation for the newest update on the Mavic Mini.