During v13 beta … does that mean that PRT will be more receptive to fixing bugs before final release?

Surely Yes, so as many of us as can, need to test v13 beta if we want as bug free v13?

I admit to not testing previous beta versions, I thought only PRT-selected users would be beta-Testers.

Seems, from what RafaelN says above than any of can test beta v13. It is in our best interests to do so?