> reduced complexity leaves less attack surface

Reduced attack surface only matters if the remaining surface is secure. Privacy-wise, the comparison here is that you've got a door with no locks, and you're arguing against putting a lock on it because "that'll make it more complicated, and then people will get in and steal my stuff."

There is no particular reason to be confident that coinjoins will protect your privacy in the long run. They've both broken in the past and they're easier to regulate than something built into the core design of the coin. This is a situation where you need a more fundamental guarantee, because Bitcoin at its current complexity level is not capable of protecting your privacy well, and I don't see strong evidence that coinjoins will solve that. You've got to put a lock on your door, even if it makes your door more complicated.

Even disregarding the fact that coinjoins are unproven, paying coordinator fees every time you want to make a private wallet is a bad solution anyway. Even if you could be confident that coinjoin wallets weren't going to leak information, you still wouldn't want a solution that had those fees, because we don't want a world where only rich people have privacy.

> at a nash equilibrium

I think the whole point of what I've been saying is that the nash equilibrium of Bitcoin is terrible. If the crypto market stays in the state it's in, it will not become a viable currency. So yeah, I don't understand why a community in a nash equilibrium where >50% of the network is subject to interference by the PRC, where transaction fees are spiraling out of control, and in which tracking is already a serious problem -- I don't understand why a community would be happy to stay in that state, complexity or equilibrium be damned.

That's what I've been saying. Bitcoin as it exists today is terrible, and making it better is going to require actual iteration, not just sitting around and trying to pump the market so somebody can buy a porche.

> why does it even matter?

Because some of us would like a functional, private, inexpensive online payment system at some point, and the entire crypto market is intertwined in the public eye, and silliness like speculative investing and NFTs distort that purpose and get in the way of other coins doing anything useful.

There's a reason why cryptocurrencies are now classified by the IRS as an investment. If you're trying to build a currency, then that's a bad outcome, but none of that matters if the only thing you care about is "becoming rich" instead of building something that's actually useful for the world.

> man in 1910: the market has universally declared horses superior to automobiles

Well OK, then don't act like 5-10 year temporary consolidation around Bitcoin means that the crypto market has decided that Bitcoin is the technologically superior option for a currency, rather than a temporarily valuable speculative asset. Particularly, don't act like Bitcoin prices prove its superiority during the same week that heckin Dogecoin prices spike.

You can't have it both ways here, either the market is always rational or it's not.

If the market is always rational, then credit cards are better than cryptocurrency in its current state. If the market isn't always rational, then speculative investment based on FOMO does not indicate anything about Bitcoin's quality as a tool for transactions.