The effect is that only discussion by the inner circle is allowed and that the process is somewhat insulated as no one who is not heavily DIR is allowed to have those discussions and in turn very good ideas that are found or practiced by non DIR divers have to wait until a member of the DIR/GUE inner circle is exposed to them and accepts them. Meanwhile the rank and filel members throw out great ideas because they have bene indoctrinated on the need for standardization at the apparent expense of all else, and/or do not recognize a godo non DIR idea when they see it. That just strikes me as odd in sport where the consequences of failiure are so unforgiving.
I think there are a couple of different ideas being confused here. You can dive however you want, with whatever gear you want. Make sure your buddy knows of any changes and team implications of such changes, and do whatever you want. What you might not be able to do is say that this new way of diving is "DIR," cause that's more or less defined. It's the same way with PADI. Dive without a snorkel, or dive without an octo, whatever floats your boat. You just shouldn't say the way you're diving is PADI-approved.
Speaking of which, if you decide you want to change a PADI training standard (for instance, implement more advanced gas planning and management techniques such as SAC rate, rock bottom, etc.), aren't you also going to run into resistance by many current practitioners, and wouldn't you also need to work your campaign up the heirarchy to the PADI inner circle before such changes are adopted?
I imagine most DIR practitioners dive in a non-DIR way fairly often; they just don't make the argument that doing so should be considered DIR.