It's not always that simple. Take my Yamaha Attitude for example. It's a fantastic bass - a P bass on steroids - with tons of neck dive. The reason why it has so much neck dive is
1) big fat neck. Maybe the fattest neck on a 4 string you can find.
2) small light body
3) detuner on the E string
The combination of fat neck with light body is what gives the bass its tone. The folks at Yamaha could have give the bass a heavier body or a smaller neck, but then it would be a completely different instrument. You can put lightweight tuners on the bass but then again you're changing the tone. Billy Sheehan actually plays with a fat finger on the headstock to give it even more mass.
However, they could slightly elongate the upper horn to improve the balence issues. The Warwick corvettes may have a phallic appearance, but damn me if they don't balence perfectly.
Ever been in a studio, given/received lessons, spend some serious time studying theory, or had an acoustic gig? I'd even imagine the most masculine metal players will take a seat when recording all day.
). Gibson seem for content with selling on a classic image than a bass that plays well.