> there is nothing stopping anybody from making something better
They already did. Half the crypto ecosystem is already better than Bitcoin if you're trying to build a functional currency. We're talking about a coin that doesn't have any privacy guarantees, it's not exactly hard to improve on that.
When I talk about religious loyalty, what I'm getting at is that it turns out the Bitcoin ecosystem doesn't seem to care that much about stuff like privacy, and whenever anyone brings up Bitcoin's flaws, or the fact that it has been outclassed by other coins, suddenly the conversation is all about "stability" and the trust of having an old coin that hasn't fixed its problems in 10 years.
It turns out that having a fixed number of coins that fluctuate wildly in price is very bad for building a currency, but we have people on here arguing that it's a good thing. It turns out that PoW is unscalable and prohibitively expensive, which is a barrier to real decentralization, but we have people on here arguing that's a good thing. It's understandable that Satoshi didn't know in advance every problem, but it's not understandable that in all of the years since then, the Bitcoin community has largely failed to evolve or learn anything about the initial flaws that the coin had.
And this is honestly a tricky conversation to have because we have to keep dancing around the fact that Bitcoin is a speculative asset and that very little of the community cares about making a currency at all. But the community won't acknowledge that, so instead we get a lot of weird deflection around "stability" and we all have to pretend that the community is in good faith actually trying to create an alternative to cash, and that people genuinely believe that Bitcoin's tech is the best way to do that.
But obviously that's not what's happening. Nobody would really look at the state of Bitcoin and argue that it's best-positioned to replace traditional currency. It's worse than cash for privacy, it has higher transaction fees than almost any other payment method, it doesn't scale environmentally, and it takes 10 minutes to add a new block. But... it is for the moment an excellent speculative investment because the speculative market is irrational and doesn't care about technology. And the speculative market benefits from pretending that it exists for some kind of grand purpose rather than just as an end to itself, even if doing so makes it harder to accomplish any of the original goals behind the coin.