There has always been a great deal of disagreement over heavy vs light instruments. I think it’s generally been acknowledged over many years that guitars that are lighter are praised by experts who speak of better resonance / sustain etc.
Whilst that may not always hold true, it has been from my experience with both guitars and basses. Having had a fair few Precisions and Stingrays over the years, the ones I thought were better were indeed the lighter ones. Whilst this may have been partly because they were easier on my aching shoulders, I do think that weight does play some part in what makes an instrument sound great. The best guitar I’ve ever played was a friend’s Fender Esquire from the 50’s, and it was also the
lightest. Likewise Gibsons, best Les Pauls and 335s I’ve owned /played have been the lighter ones. My 63 P bass is fairly light at under 8lbs, and my regular gigging bass is a P-Lyte at 7lbs ( as you would expect!). Both are very resonant basses.