I'm quite familiar with the Ibanez line of basses. After 45 years and some time away, I came back to playing bass and bought a Gio SR206 six string bass. Yes, it was only $379, but while I know there are more expensive SR's available, mine is perfect in every way. Beautiful bass. Wide, flat and thin neck with a perfect fret job, and came setup very well where I didn't really need to make any adjustments aside from some string height and intonation.
The tonal options, playability, and fit and finish on it is
excellent. I've owned a lot of basses, from cheap to extremely expensive ones over the years and I've always done my own setups and mods. I've even made my own basses. I know quality. So, I'm not quite sure by what you mean that anyone would assume Ibanez is not a quality manufacturer based on their lower priced options. If anything, with my lower priced Gio SR206 being this good, I would assume that to most players anything more expensive is just as good if not better.
I think the higher priced ones just offer different options (finishes, hardware and electronics, etc.) that of course cost more. That doesn't make them better, just different.