It's a bit late but what do these specs mean?

The f and the 16/20.

I thought I was getting 20mp but all the camera apps say maz is 16.

And for RAWS, dinner say 13, OpenCamera says 16.

Why does my phone (most phones) record video that are like 100s of MB for just a few minutes? Where as I can download the same video and similar quality but much smaller from Youtube after I upload it?

Originally I used Youtube to stabilize videos but seems they removed that... so now I just want the videos with reasonable size.

Not sure if this was from OpenCamera (I think I have it forcing 4K UHD, prolly don't need); I don't know what the setting is in Camera, can't change it.

But smartphone videos are always huge...

The OP6 camera app is actually good?

Just went through the latest batch of photos I took. I used the default Camera app for half (no RAWs) and OpenCamera for the other.

They were on different days and weather but I just went thru the Camera JPGs and couldn't find any that I would want to mentally correct...