As a 73 year old who actively gigged into my 60s with 10 - 12 pound basses, my advice is to go lighter. I made the change from some really great basses and haven't looked back. I don't feel I've sacrificed anything in terms of tone. If anything, I've learned much more about the variety of instruments available, different features available, have been able to be more selective in terms of ergonomics and playability, and have found better instruments (suited to me) as a result.
I feel these things have extended my playing career and have made me a better player. Now the question. ..."Did the lighter, more ergonomic basses make me a better player?" The real answer is, "No, I made me a better player". The lighter, more ergonomic basses helped because they are comfortable to play, are enjoyable, and create less fatigue, which makes me play them often and work on a greater variety of music. My requisite 5,000 hours have increased exponentially over the past decade.
Remember, YMMV.
Hope this is helpful.
Koog