I guess it depends on the gigs you play and other factors. Once a bass gets above 9 lbs I start to lose interest. I can get great tone in a reasonably light package ( and actually my Rob Allen Deep 4 has more earth shaking bottom than any instrument I've owned and it is 7.1 lbs). I agree that balance is key and my MGS at just under 10lbs is well balanced. But on long sets I can start to feel the difference between that and my YYD (which is under 9lbs).
Tone is important, but weight is an important factor for me. If I was playing seated all the time it would be far less of an issue. If I didn't have decades of accumulated injuries and wear and tear on my joints it would be less of a factor. But I'm stuck with me

As a result, I have chosen chambering to help deal with that. Luckily, I prefer the resulting tone as well - win/win. fwiw I used to be much more of a weight weenie, but Fodera cured me of at least part of that obsession. It remains a factor but I pushed my limit up a little higher...