First of all Dubont, you, and I guess your other mage buddies in your LS, need moar VIT + MND and maybe PIE. Fuck everything else, seriously. checked your profile on Lodestone and its woefully lacking in VIT and MND.
Now to address the points you made:
1. Are you the only mage in your party? I Ask this because, whenever my LS do dungeon runs, we the mages share the load between ourselves, and while we do run out of mp, its rare.
2. Really? I think your party may be doing something wrong here, though I actually have no opinion on where they should be on separate timers or not, that will not affect the ability of the mages in our LS to play the game.
3. This I do agree, I think SE have said they will be addressing this issue soon though.
4. All I can really say here is that you and the party you run with need to reevaluate your strategies, as something is not right here.
5. This I disagree with the most. As someone before has rightly said (I forget who) this is the first REAL content we have gotten since the launch of the game that we can not blow through. It may be difficult, but its NOT impossible! keep at it, you'll get through it eventually. Pro tip though: let your tank come out of the cutscene first and get your DPS gather in one area, and the mages in another area, and watch the phases.
6. EMN seems sooo much better than it did pre nerf, at least for me. Not sure what to say here, refer to the above?