I've seen Team Teleport used once, years ago, and it was very effective in that singular role - letting a full team of (in this case) all Defenders zap around the map in a tight group, buffing each other into the stratosphere and melting everything around them. That is not something I've seen reproduced since, making it even rarer than farming, and thus its utility in that very specialized circumstance does not, IMO, justify retaining its current function.