I think all academics agree that the traditional account of muslim origins is largely mythological ,
It's inexact. 90% believe in the frame "Mecca/Medina/Prophet Muhammad" as the genuine origin of the Quranic text the others shut up (like Dye for example.)
i would guess.assertions that there is no hijaz before islam seem misplaced. Hijaz is a geographic term referringto the western coast and mountains of arabia. You can call it anything you want but it was a region.
The word "Hijaz" is totally unknown before Islam, like Mecca, Medina, Zem Zem, Kaba, etc. Totally unknown unless you have a source to prove the contrary. It is an invented word by Muslim historiographer of the 8 and 9th c. to give a "name" to a place which had none. The origin is I think logically hajj/pilgrimage. There was no region call "Hijaz" before Islam. End of story. Or prove it with sources. No sources, no region.
Robin thinks it is thmt in the south arabian inscriptions.
Robin can think whatever he wants, he has no sources, no evidences. Like Muslim. The only difference is that he is not. But in the case of Early Islam history there is no difference between them apart the supernatural. But I do not argue about the supernatural here, I argue about the historical affirmations of the historiographers of the 8,9,10th c. These affirmations (Mecca/Medina/Kaba/Prophet/Abu Bakr/Utman) are corroborated by nothing. Therefore you have to trust these accounts. I do not. Why? Because there is no source to corroborates them, It's as simple as that.
Yathrib is real obviously al-hijr is real tabuk etc.
Yatrib is real. Ok. What is Yathrib in the 6 and 7th c.? Does it correspond to what the historiographers of the 8,9,10th c. tells us it is in the 6 and 7th c. Not at all. It never mentioned as a caravan route after the 3 or 4th c. Even Ḥimyar do not know it. It is a poor oasis, a swamp, serving to give water to the local camels and no sources say other things.
al-hijr is real. Ok. al-hijr is what in the 6 and 7th c.? A ruined city. There's nobody there, except tombs.
tabuk is real. What is tabuk in the 6 and 7th c.? No one knows.
But the "prophet" where is supposed to live? Yatrib, al-hijr, tabuk?
Not at all.