Fair question. The issues that the bass had (things that made it not play like it was supposed to) were dead strings and very inconsistent levels string to string (piezo bridge pickups often have that issue). I fixed both of those - took the thing apart and got the bridge to sit on the piezo pickup (involved cutting it into two pieces so the thing was not constrained by it's stiffness) so that the strings were balanced, and I put a new set of strings on it. So, for most of my time with the instrument, it didn't have "issues" - it played as well as it could. So....switching gears a bit....
Musical instruments are tools, but they are also emotionally charged objects used in the pursuit of ephemeral art - they should, even if they are challenging to operate, give us some amount of joy in the process. An instrument that inspires you to play - it sounds or feels so good that you want to play it - that is a great instrument (I don't care how much it costs, that is the sole thing that matters). The rationale behind that is that the music ultimately comes from you (not the instrument), and for the music to be really "you", you have to be well practiced. If the instrument does not inspire you to play it, you won't practice enough, and...you will not be a good musician.
Most of my basses are 5 string one offs that I built - they all have the same physical platform - same neck, very similar body geometries. You can pick one up blindfolded, and until you play it, you can't tell which is which. They differ in type of pickups, locations of pickups, and electronics - they have different sounds, different vibes, but the physical interfaces are essentially identical. I have one bass that isn't like the rest - it's a 4 string short scale (I also built that) that is different in pretty much every physical aspect. It is, because it's different, and my muscle memory is built around the 5's, challenging to play physically - things are in different places, I don't have a B string, so I have to rethink certain parts, etc. But...it is a gas to play....It doesn't do what the 5's do, it's different. Despite being ergonomically very different, it is (to me) a great instrument.
At no time during my time with the ABG did it inspire me to play - it felt dead, it felt like I was doing all the work, and it was fighting me the whole way. It's like flat wound strings - to some folks they make an instrument into one that inspires them. to me, I'm struggling - it does not do what I want it to do. and everytime I pluck a string it dissapoints me in what comes out of it. ABG's, to me are not great instruments - they do not inspire me to want to play, they make me want to put the thing down, and do something else.
That said, that certainly doesn't mean that they can't be great instruments - for you. They're just not MY thing.