Let's assume that Ethereum gets properly sharded, and web3 solves all these technical challenges somehow, because that's supposedly where Ethereum is headed.
Why would I as a user prefer Twitter or prefer web3 decentralized microblogging?
With Twitter, even with minimal gate keeping, I still get a spam/scam message only once every month or so.
But minimal gatekeeping is soooooo much better than email, where I get so much spam email that it has made the service worthless without spam filtering, which has an error rate for finding spam.I literally only read my personal email messages once every week or so because it's such a chore to get through all the craft spam, much of it from places where I once bought a single item.
So as a programmer and creator, sure, you prefer the ability to not be locked out. But as a user of Twitter, I vastly prefer all those programmers being locked from access. It's the only thing that keeps it sane and almost-useful.
One application I recently heard of that might be relevant: using wallets as crypto for the average person, finally allowing more secure and better website login. If everybody has wallet, it might finally solve the problem of scattered passwords everywhere for every site, with many users reusing site password.