Always interesting to hear other perspectives. I find if you ask ten different laminators how they prep a master or tool for laminating, you get ten different answers.
I have used wax on its own, PVA on its own, wax and PVA, wax and hairspray and also some of the hi-tech release agents that you wipe and leave to dry.
If you use wax alone, I find you have to be extremely thorough in your coverage, and even then, some of the resin tends to cut through and stick on a master, most likely because I have tended to use air dry paints which aren't as tough as the two pack paints pros tend to use for finishing tools.
I think when starting out you need to gain confidence, and that can easily be compromised if your first attempt ends with a locked in tool. So I always think a two stage release process is worth the effort, as unless you make a complete pigs ear of things, you are almost assured a release.