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True, but there are other benefits too. Bots can’t crawl through your likes for example. Maybe you want a feature on lemmy or mastodon or whatever with anonymous polling? (ik masto has polls but for sake of argument) Maybe you’re implementing anonymous polling into an app for a trade union that needs total anonymity even from admins? It’s not totally unusual!
IMO it makes sense to do this at a platform level just because there’s a unified implementation of obfuscation across all the fediverse for any platforms that want to use, rather than a bunch of unique solutions that would be duplicated effort.
People have really weird usernames sometimes