Why don't more pilots use Runcam Split?

It still seems that most pilots prefer to use a GoPro mounted to their quad instead of running the Runcam Split.

Why aren't more people using the Runcam Split?

Wouldn't it be beneficially to get rid of some of that weight from the GoPro?

Is it because the GoPro has higher quality video and these big name pilots want the best footage possible?

Enlighten me reddit