I really believe that there's some misunderstanding about how Trail of Cthulhu works, and a lot of it seems to be along the lines of "Well, I already do that in my Call games". To this I say, undoubtedly, but it's not actually in the Call rules. If the worst crime that Trail has committed is to make explicit the way Call is actually played then that's probably not so bad, especially for new players.
And if you do already play Call of Cthulhu that way, then hurrah!, Ken Hite and Robin Laws applaud what you do. Could you have an greater justification? And what's more there's a whole squamous wodge of new eldritch doom to explore in the chapter on the Mythos, the supplements and scenarios.