Contrarian view here--for me, ETH has different use cases (e.g. smart contracts) and can compliment BTC. Same with SOL - solid use cases due to transaction speed.
BTC doesn't need to do everthing (and in fact there are significant risks in modifying the protocol in order to add features).
A Ferrari and an F-150 both have valid use cases. Trying to make one do both jobs compromises their core strengths.