The issue of "Use only my stuff" can be traced back to UL.
When a manufacturer sends their product to be tested for listing UL does their battery of tests using the recommended parts, adhesives, sealing compounds, etc.
UL doesn't test every possible permutation of all of the manufacturers unless you pay extra for it. That's why when I was with Appleton you had to use Apelco sealing compound instead of Chico for the explosionproof fittings. Nobody every said that Chico wouldn't work in an Appleton fitting; it's just that there you would end up with something that UL had never tested.
Some manufacturers go out of their way to pay UL to test their products with other manufacturers (replacement circuit breakers spring to mind), but that's the exception not the rule.
