I think we were pretty similar, with Rongway adding some neat FFXV Noctis weapon like vibes and detailed rules. Seraphor too, adding some detailed rules. Also all for probably for similar reason but not sure, at least personally, suggested the 1.0 concept as it were, because it sounded unlikely to me that they'd release a bunch of individual unique hybrids of their current jobs (especially as it would open up a factorial of requests of which jobs would combine with what into a new job). That however, one hybrid to rule them all was quite a bit more likely I imagined and was still in spirit what was requested (hybrid job system).
That isn't to say a more custom tailored hybrid concept couldn't be fun, primal bullet gun blade katana sounds fun, just thought if they wanted hybrid concepts specifically that something like that could be well represented in such a job. As if they were going to make something unique that it would probably not be a hybrid and more likely something entirely self themed- like beastmaster or puppet master and not based on if two jobs were combined. Also suggested onion knight because I thought unlike losing something unique to the limited job system that creating something known to be weird would be a smoother and easier experience (like how some may feel lost with blue mage). If his primal gun blade katana job ended up having awesome story and visuals and playing interestingly it would be sad to some people it couldn't be a main job- where onion knight just sort of glides into limited job life as that's pretty much his life in general lol. Maybe the original limited job XD.
So yes I got what they meant, and I imagine others did too, I thought it was a potentially interesting idea too, but then suggested something to fit into limited framework that I'd think is less sad to lose to main content and more likely to be done as well. Nothing wrong to continue liking the more specifically tailored hybrid of course.