Fair enough I will agree to disagree but I will just add one thing and that is it just seems to me that your against the idea of opening it up now as opposed to later out of spite or ego in the sense just because you do not think they can do it you do not want to give them the opportunity or chance to even try to prove that they can indeed do so despite your disbelief. It could be that it was not your intention to come across that way...but you are coming across that way to me.
Opening it up now after final coil came out would do nothing to stop you doing it the way you currently do, it would just give others the opportunity to do it a different way on old content in an effort to potentially catch up just like SE has done with a lot of older raid content I mentioned above. I kind of take issue with this mentality of just because you think others cannot do something differently than how you do it, that it should mean they are not allowed to try or even not allowed to try until you decide they might succeed...if everyone in the world thought that way we would still be living in caves bashing each other over the head with rocks and grunting to communicate. We advanced because people did what other people previously thought was not possible.
SE should open it up (2nd coil which is old content now that final coil is out) and let people try doing through DF without full group restriction, yes they may fail but they might also succeed and will not know until they try. I also take issue with SE not doing so with patch 2.4 in the sense they are doing the same thing for potentially the same bad reasoning as yourself. It is one thing to keep a restriction on new content because want to preserve the egos of those who claim to be hardcore but it is another to keep that restriction on old content after new content has been made available for the hardcore to do (their egos intact) just because they do not think people 'can' do it. Fact is will not know if they can unless allow them the chance to try.