I agree with you - I never use ND filters and use CPL filters but I might ditch them as well - I never understood why you-tubers constantly push 24fps - looks like crap when you pan. I prefer the 4k 60fps my Evo 2 Pro provides but when using my Mini 2 it's always 4k 30fps.
I also dont understand when folks use an Evo 2 pro or a Phantom and only post at 1080.....Why not show your subscribers the best quality you can.
Thanks again for posting this.
I will admit I almost never post at 4K even though all of the source material for a project is 4K or 6K. The reason I downscale is because I typically mix the drone footage with footage from other cameras and with my cinema or handheld cameras I frequently like to recompose the shot or add motion where there was none; by shooting 4K then cropping to 1080P you get up to 2x in every direction to work with the footage. You can also add lossless image stabilization, horizon straightening, etc if you downsample the original 4K footage.
The final thing I do since YouTube uses a different/better codec for 2K and above footage is I then upscale to 2K for a YouTube delivery. If I happened to not need to recompose any of the footage for the whole project I will occasionally deliver at 4K or if a client's project mandates 4K source footage then I will deliver at the original resolution but the reality is, few people will ever notice the difference in 4K vs 1080P since 75%+ of online content is now viewed via tiny cell phone screens at 360p.
If 6K or 8K ever become economical options then I will start to regularly deliver at 4K. If the EVO II had 10bit 6K I would be more inclined to deliver at 4K but since 6K is only 8bit I usually only shoot 4K.