Garmin 430 and ILS

The airlines have been flying the RNAV overlays of the conventional
terminal routes on an ILS for over 20 years.

What the airlines do is irrelevant to General Aviation operations.
They're using different equipment and operating under different rules.

You don't need to be checking underlying nav facilities during such
an operation.

That's your opinion, for which you have been unable to offer
supporting evidence. The AIM says differently.

It sounds like your both anal retentive

You mean "you're". ;-) Is it anal retentive to want to follow the
law? Ok, guilty.

and spring-loaded to being unreasonably argumentative

I must admit that I find it annoying and insulting when someone tries
to pass off a series of irrelevancies and non sequiturs as an
explanation. I usually associate this with someone hiding a lack of
knowledge.

yet you are unwilling to do your own leg work to get to the folks in
the FAA who can answer your unnecessary question.

This is my own leg work. ;-) I have also exchanged emails with the
folks at Garmin, who were also unable to offer a coherent explanation
as to why I could use their equipment in this fashion.

Finding someone knowledgable at the FAA is a real chore. There also
I run into people who try to "explain" things to me, only to find out
they know less than I do on the subject.