I prefer the approach of the Gothic series, where weight is irrelevant, but you can't pick up every spoon in the world. The actual interface wasn't great though.
I like items to have weight in immersive sims and party-based RPGs as long as inventory management isn't too much of a hassle. For action-RPGs, I'm fine with things being weightless.
Yes, but in Solasta it's relevance doesn't extend much beyond halfway into your 1st level. It's still very much an aesthetic rather than a key aspect of early monetary accumulation and trade.