Four dps have been able to clear the H4 since it launched, and it launched the same day Campaign/Black Hole gear was introduced, so it was doable in Rakata (and probably less, but I'm not going to pretend I remember the quality of the gear of the various PUGs I've done that one with). Since mid/late summer using the group finder for a flashpoint has awarded Black Hole comms, which may be exchanged for gear that is better than Rakata. Meaning the requisite level of gear is available to everyone. Also, now everyone has a full set of Tionese, which is probably sufficient. I guess if the entire group only had Tionese gear it might be a problem, but that strikes me as an edge case; a group of four friends who do dailies but don't do flashpoints? Actually, now I wonder if I can get some people to try that H4 in just Tionese and see what happens. Could be fun.