Moreover, most altcoins were never even intended to function as money. They were created for other purposes such as utility tokens, governance tools, platform fuel, or pure speculation. As a result, they don't meet the basic criteria of sound money like Bitcoin
Even if bitcoin meets the criteria to be a sound currency because satoshi created it to be a peer to peer currency. It was also not used and could not become currency. Not only governments, organizations but even we, the early investors, have never considered and used bitcoin as a currency. Just admit it, we all just consider it as a speculative asset to enrich ourselves.
Sorry, I'm not a bitcoin maximalist and I also disagree with you that altcoins don't solve any problems. Yes, most altcoins are centralized but they are scalable, faster, lower transaction fees than bitcoin. There are also altcoins that offer better anonymity and privacy than bitcoin like Monero, Zcash.