What's amazing is it's
not obscure. It's in the plain language of the poem—you either read it (something like) that way,
or you have to, IDK, assume Frost was just so extremely sloppy or inept that he got all confused a couple times in the middle of writing this short poem but then published it that way regardless, and then also decide that the common reading (despite all the confusion and contradictions) is the one you're going with for—I can't even imagine what reason, because it's what you get if you only pay attention to the very beginning and very end of the poem, and not very close attention to those, even, I guess?
The latter is ridiculous... and yet common.
What this reveals is that an enormous proportion of people who can read, cannot do so at all well. This isn't like catching the multilingual puns and their significance in Finnegan's Wake, it's quite straightforward, at least insofar as it's plain that even the surface meaning is not "I in-fact took the road less traveled by, and that was good".