People explaining to you why things are not good ideas or calling you out on your incorrect stances on things... eg.

Quote Originally Posted by Sakurakiss123 View Post
and who doesn't also see thunder 2 and thunder 3 useless mp sucking spells
is not people "attacking you". It's people informing you why you're not right and why your suggestion may need more thought put into it.
Honestly, if that's how you view it, I recommend you stop posting on this forum entirely (just to be blunt, nothing more). Entirely because this forum is for discussion. This means both positive and negative points can be brought up.
If primarily negative points are brought up, perhaps you should start considering that your idea may be one that needs some more thought put into it.

That said --

Not every skill/ability is cross-classable because it either doesn't make sense for that class/job to have access to it, or that the job itself is actually cut off from being able to have those abilities - like how Warrior has access to Gladiator cross-class skills/abilities and Pugilist cross-class skills/abilities - but nothing else.
Your suggestion is to essentially overhaul the entire class/job & cross-class system when it really does not need doing at all. It's fine as is, quite literally.

I would like more cross-class skills to choose from to spice up variety of gameplay a little bit (damage focus, buff focus, debuff focus, skill focus, speed focus etc.) - but that doesn't require the entire system to be plucked apart and practically Destroyed in terms of functionality to accomplish it. That's all fine - we just need more abilities... Which will be happening.
They're bringing out more skills with the update on level cap to 60, so I'm personally waiting to see what happens with that before doing anything or suggesting anything - especially considering the current system functions just fine.

To coin the old phrase: "If it ain't broke, don't fix it."

As a final note: I personally believe this is a bad idea. A very bad one, in fact.
It seems poorly thought out as it tackles one "problem" (*cough cough*) without taking in to consideration the effect it would have on the entire system.
What you suggest pretty much requires that the entire system be re-done.
The entire system should not be re-done.