This is good advice. My current armorer kit has enough parts to build two complete guns if you gave me the stripped slides and stripped frames. Then you need more of the parts that will need replacement like recoil spring assemblies.
FWIW, Glockmeister and McGill both had factory gen 5 RSA's in stock, of course 50% higher than armorer prices.
The only reason I have bothered to maintain my armorer status with Glock all these years is the buying of heavily discounted parts. Based on yesterday's disappointment, I will rethink that investment when my current certification expires.