It seems like theymos is likely even against showing which users are banned publicly (not sure why, especially when people are reporting dozens of users a day that are already permabanned and it's time-wasting for both users and staff to have to report and handle these).
If theymos is against of showing which accounts are banned, then maybe he make an exception for members that have 300 good reports at least? This will reduce an extra work for active reporters and moderators.
Is there any point in seeing who is banned? If someone has a problem with user "A" and he has reported user "A", just bookmarking his account URL or checking it from your PMs should be enough for you. Unless you have reported tens of users and you want to be updated on all of them! x)
But a system like that would either require a lot of manual work from the site's team in order to publish the account names (most of which would probably be bots) or it'd require resources to be spent on an automated system. In either case, I find it unnecessary.