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[RyanVM]

I don't understand why people seem to be using that method so much lately rather than just executing a cmd file from GuiRunOnce in winnt.sif. Is there some advantage to starting them from the registry that I'm missing?

at the time of installation it's probably the same, from unattended guide:

First of all, remove the [GuiRunOnce]entries in winnt.sif, as RunOnceEx can be used to replace [GuiRunOnce] completely. Although you can use both if needed for some reason, but they will both run at the same time, so use caution.

at the time of testing, you can't use guirunonce but you can use runonceex

Oh, so you're adding the registry entries in for RunOnceEx to test it then? I guess that makes sense.