The lessons of TMI have been learned though, the accident has been thoroughly investigated and that's the reason why it's now being discussed in class.
Of course but we're talking about vintage control room designs here, some of which predate that investigation, so it still seems relevant to point out.
AFAIK All of them have been retrofitted to take the lessons from TMI into account (I can't be sure about other countries, but in France it's definitely the case).
And more importantly, the process around how you're supposed to take information from the controls during a crisis has been completely rethought, negating the issues found during TMI investigations.