Maybe "hasn't been done since actual G1" is not the way to make the case, but those counterexamples cited ARE all in the neighborhood of 20 years old. And in that time we've had a range of different expressions of the Arrival To Earth. (I would disagree and say that the specific "crash, Teletraan I reformats, etc" sequence in particular isn't what's iconic or essential about that Arrival, and appreciate that we haven't always been locked into that comparatively narratively slow setup.)
I haven't missed that specific one myself, but it's fair to say it was due to be seen again, to be revisited and experimented with.
The question of which (Sunbow/UK comic) would be more familiar to the general public shouldn't really influence which origin would be more sensible to use in media, I don't think. As CoffeeHorse notes elsewhere, while people may have been more exposed to the cartoon (whether via terrestrial broadcast or the movie), it's not like the broader public followed or retained much about it in depth, let alone the origin story only revealed in the third season (after a polarizing movie that killed off the lead and that many then thought ended the franchise).
For fans I can see the appeal of the Primus origin as something more ambitious than "these goofy aliens from what felt like a random filler scene in the movie? They actually made the Transformers". Especially as an alternative rather than the primary idea, if some (like me) encountered or became aware of this after having seen the Quintesson origin, maybe having to seek it out in a niche of a niche (not just the comics, at the time far less mainstream, but an outside-the-US run). The more florid writing and the leaning on familiar mythological/even religious tropes help sell it too, and a mystical or mythical element is a useful, fun narrative card to play. Even the narrative mess of the movies looked to reconcile these a bit with Quintessa, who is a fascinating way to play with the concept that isn't done much with, in traditional Bayhem fashion.
It also kind of avoids muddying the situation by having the Transformers (aliens) be created by aliens who are aliens to them. (For stories where the Transformers are presented as aliens this kind of requires two layers of presenting a set of characters as alien and unfamiliar and bringing in all the associated tropes.) TF One has them both just be neighboring alien races, which is an easier story to tell.
(I'm not saying the Quintesson origin is without merit, as there are a lot of narrative possibilities there too. I'm mostly just trying to trace how the Primus origin might have ultimately won out at Hasbro as the more marketable option.)