Problem is: in its current form, the thing is not actually something that people want.
I think that's where MVPs come in: you don't have to only build or only do customer research. MVPs feel like the solution: build just enough so you can have effective research into the problems of your potential customers (and your own capabilities like Satoshi mentioned).
On the other hand, NOSTR and the Lightning Network are both projects that feel like they were built along the "if you build it they will come" way of doing things.
I think if you're building a protocol, this mindset of "if you build it, they will come" applies more. Protocols are meant for others to come and build something on top of it. Your "customers" aren't end-users.
But if you build a product, service or however you want to call it, it's different.
In the last few years, I've seen plenty of projects that were somebody's great idea but nobody (at least not many) ever came around to check it out.
I agree