Yeah, I don't know that I agree with #1 either. The bridge looks to be basically in the same position as my Thunderbird, or my Ibanez Destroyer, or the similar Schecter model. The body shape and size is very close to a Thunderbird, so I'm just not seeing it. To make the neck "feel longer" they would have to move the bridge towards the neck pocket and mount the neck farther out from the body. But if you lay images of the Kellybird and Thunderbird over each other, they are basically in the same position. So I don't know that I agree that it will feel longer.
Neck dive is a thing on any bass with no upper horn, not just the Kellybird. But there's a whole "club" of players who love Thunderbirds, and the neck dive doesn't seem to bother them. The headstock is smaller than a Thunderbird, so that should help get rid of some neck dive.
#2 and #3 are personal preference. Fender has been selling Telecasters for eons and they don't have either of those carves, but it's an insanely popular model.
I can see #4 being slightly annoying if you're a player who constantly fiddles with knobs.
As for the case, Jackson sells a gig bag for the Kellybird, and there are some used HSC out there for the Kellybird, before Jackson stopped selling those cases.
Pickups and tone are personal preference too. Pretty sure it's a standard soapbar size so they could be swapped out for about anything you like. Or just run it thru effects and make it sound how you want.
It's all subjective if you ask me. I like them and have considered buying one for quite some time, but the right deal hasn't come along yet.
Neck dive is a thing on any bass with no upper horn, not just the Kellybird. But there's a whole "club" of players who love Thunderbirds, and the neck dive doesn't seem to bother them. The headstock is smaller than a Thunderbird, so that should help get rid of some neck dive.
#2 and #3 are personal preference. Fender has been selling Telecasters for eons and they don't have either of those carves, but it's an insanely popular model.
I can see #4 being slightly annoying if you're a player who constantly fiddles with knobs.
As for the case, Jackson sells a gig bag for the Kellybird, and there are some used HSC out there for the Kellybird, before Jackson stopped selling those cases.
Pickups and tone are personal preference too. Pretty sure it's a standard soapbar size so they could be swapped out for about anything you like. Or just run it thru effects and make it sound how you want.
It's all subjective if you ask me. I like them and have considered buying one for quite some time, but the right deal hasn't come along yet.

