Yes, 99% of alts are trash. But there are a handful that are legit. There are many things alts provide that Bitcoin cannot.

Strong default privacy, real world fungibility, extremely cheap transaction fees are just a few. All while remaining non-custodial, permissionless, and P2P.

You can't be good at something you don't specialize in. You also can't be good at everything because each aspect requires trade offs that are mutually exclusive.