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it comes at the cost of some privacy.
If it's not searchable, either here or by indexing, how much of an issue is that?
If someone wanted to find TW2, they could search for the user and not find them. They would need to already know that my new pseudonym was TW in order to link them.
I guess it would be possible to click on every single username and view the name history, or programmatically scrape the same. But if you're the sort of person that does that, you could just as easily derive all previous names from the wayback machine or Google's cache.
This has two problems:
The current situation is the best for privacy, and security.
But if people feel that this has eroded trust, as people could change their name and you cannot see the history of who they were and carry trust forward... then I can fix that, but it comes at the cost of some privacy.