Hi James,
apparently the hyperbolic bits in my writing are causing you affliction
You really have no idea what you are talking about
Fine, then don't listen to me. You know how to use the "ignore" feature, do you?
Not all airliners are RNAV approved and therefore must use raw data by law,
An authoritative source for the second statement in your sentence, please? You will also note that I did not mention RNAV, only the presence of a sophisticated autopilot outer-loop control structure of some sort.
Normally alot of those instructors have done more IFR flying/SPO's in demanding conditions than some airline pilots.
I don't question that for a minute, with the way they make it difficult for themselves
What on earth gives you the experience to question the knowledge of an IR instructor
That in itself is an ingenuous question.
Then don't feel you are qaulified to give advice to people on this forum who are learning and trying to get good sound advice.
Trying to get good sound flying advice from an internet forum?

Now I'm worried
Pointers to information, yes, broad opinions, ok, but advice? I would have thought only a creationist would feel brave enough to do so.
Your previous comments generally show that you do not have the knowledge or attitude to do so.
Oh, we definitely agree about the attitude, and mostly so about the knowledge.