Now that name changes are available in-game and we can see a player's history with /p, I think it would be nice if you could also see the player's previous name(s) on their profile page. This way, you do not have to go in-game to see who posted on the forums.
I'd assume relatively easy to be honest. I know it has been done on Spigot: https://www.spigotmc.org/members/_cory_.4411/#unc
It's not about lock down, but rather not wanting to make core edits which will only make the day we finally upgrade the forums harder. Spigot is using the newest XenForo which pretty much is default behavior to show name changes.