OP It is like you are being purposely moronic, here's some actual information for you in regards to gearing and lies, which is all you have done with you verbal diarrhea because let's face it that's the only intelligent thing that can be said from your post.
I have geared 3-4 classes in full dl accessories and only one class with mythology and coil gear, as it is right now the design of the game allows for that type of gearing, which is the best gear possible to access endgame content, there are a plethora of ways of obtaining it and no one will argue that someone with relic and full dl isn't capable or useful for Coil. so you point is null, you want the best gear there it is, in any other game you gear first the one character and then start from "scratch" and then you take the same time gearing it up, here whilst you play with your MAIN class you can effectively gear other classes. gearing one or more classes with rare gear it's even easier if you run a static or with your FC on something like coil (which i don't see why you would want to do it any other way) you take in 8 people from whom are all going expectedly in their best performance job, clear let's say floor 1-4 and from that gear chances are drops are going to fall that aren't mean for any of the jobs already there, if you have a secondary class already geared with relic in which you are competent you can greed for it against others essentially gearing a class, whilst clearing content with another.
Adding to this there is going to be Crystal Tower which will be easy enough to clear through duty finder, which will drop gear lvl 80 which will essentially gear your secondary classes and here's the kicker the only content that is being locked are the maximum gear lvl 90 which SHOULD NOT be easy to obtain, why because god forbid something takes effort in this game.
Your problem is not that the gearing multiple class play is impossible. I'm fairly satisfied with 4 classes i have geared so far they have the best gear for the uses they have and they are competent on any content to date, and the gear they have will also be relevant to help me clearing newer content from which i will gear them with better equipment, while i keep gearing my warrior and paladin, which are my MAIN classes, with top notch gear to spearhead the toughest content. I'm satisfied with this, so is any player with any common sense, you on the other hand are just a spoiled ass with the twitter/facebook mentality where you think anyone should and wants to listen to anything that you have to say.
When in fact all you are trying to say is i have no patience i do not want to work for anything and i just want everything the moment i say it so i can say i'm the best that is a biased useless opinion. nothing more nothing else certainly not something to waste forum space for.