I had a 7 lb. Ibanez with the 2x2 headstock that was on the verge of neck-dive with the standard machine-heads on it.
The body that made it 6 lbs. actually did present neck-dive.
I owned a U.S. G&L ASAT, now talk about neck-dive, but they have the short upper horn, Telecaster shape.
There was a guy boasting on another forum about his 7 lb. L-2000, Empress body, but he was honest that it has neck-dive, but he also tries to downplay it.
The 4-inline headstock, combined with the thick neck, are risky for neck-dive on G&Ls IME, which is a bummer, because they have The Best pickups in those MFDs.
I think most people compensate by using a suede strap, which would grip your shirt & prevent the neck from sliding down.
I don't actually like leather straps & have nylon or neoprene seat-belt style straps, so I'm the first person who is going to notice an imbalance situation.
At least one big builder has openly stated that his basses don't have neck-dive, the users just need better straps. I won't even look at their products, LOL!