Before I joined this group I never once considered the weight of my multiple basses (over the years, I only have three right now) to be an issue. You put it on, you played for 10 minutes or four hours, you took it off. Maybe I am just more sturdy (or just heavier, I weigh 215 lbs) and the weight of the bass never made a difference. It sure is a huge item of consideration among many people on this site.
Yeah, in 25 years of playing bass, I never once put an instrument on a scale, until last year, and that only because the incessant squabbling about weight on this site made me curious. My StingRay, which I'd happily played for 17 years at that point, weighs in at 9.4 lbs.
In my opinion, heavier instruments sound better and have more sustain, though there are obviously limits to what can be comfortably held for 3 hours straight. My StingRay doesn't feel any lighter or heavier than I remember of my first bass, a Fender Jazz Bass Plus V Ash, so obviously a ~9.5 lb instrument is perfectly comfortable for me, and I don't understand why anyone would need a lighter one. Want, maybe, just for ease of transport, especially if carrying a double gig bag, that I can see. But the Warwick Corvette Standards with solid bubinga bodies are not instruments I'd want. The 6-string versions are easily the heaviest instruments I can ever remember picking up. They sound amazing, but OMG the weight! Wouldn't surprise me if they were over 15 lbs.