No. The open source drivers are better at almost everything. The only reasons to use the propriatary one is if you need some OpenCL improvements of if you are using a Radeon Pro GPU. For normal usage and gaming the open source driver will offer more performance and better compatibility.
Yes PoP OS is going to update the driver in their repos to this versions. Unless you realy want the new driver just wait the few days/weeks it will take for it to arrive in the official repos
Are you sure you are using the nvidia GPU? If your laptop has an iGPU i could be defaulting to running on that.
Looks like seank got a new job at motorola
I honestly don’t realy know. The Arch wiki says that there are some differences with AMF and OpenCL but I don’t know how up to date that information is.