I think i get your point in general, but still...in practical terms, even though the definition might not be as accurate or precise as you'd like, micarta is used by makers and suppliers to describe a specific material that has to have certain characteristics....otherwise people won't buy it. It's the reason I will never buy micarta again from the supplier I got the micarta for the knife I posted above.
My point is that, many people have seen the beautiful sculpted micarta handles that for example nick wheeler has made for some of his knives in his famous wheeler/paranee project. Or look at old Bob Loveless knives that have handles that are described as micarta (linen or canvas).
If I now have a collector that wants a knife with a micarta handle and I present him with something that does not remotely resemble (for the most part...in general structure and looks) the handles that famous and established makers have made in the past, he won't be satisfied with it.
Also I have never seen anyone, maker or supplier, call G10 or Carbon Fiber as Micarta. Again those are all materials that have been used by great makers and are therefore very much distinguishable from each other simply by how they look.
On the matter of professionalism I think that we just have to agree to disagree.