@asspirin said in Suggestion: Different spells have different armor requirements:
By voluntary nerfing effect of mage gap closer you basically wrote youยดd use weaker version of warrior skill you can use with full potential. Why would you do this ? 
No. In fact my point is, warriors should not have long range "jumps", "charges", or any long range gap closers.
So basically, everyone (regardless of "school") can slot a "transportation" skill in skill bar (as long as he has learned it), and then depending on how heavy armor is currently on you, that "transportation" skill, would produce longer or shorter range transport.
If your armor is 5kg then you jump (arbitary numbers) 20 yards, if your armor is 50kg, then you jump 3 yards, if your armor is somewhere in between, you jump appropriately as well.
So basically each skill used, would check many factors, and one of factors would be total armor weight in this case.
So other type of skills would check other factors, depending on what they do.
So basically I wouldn't tie an effectiveness of skill purely to "specific school", but to various factors currently tied to character (like weight of equipment currently on him).
Of course this is only one option. In case heavy armor offers "better protection", and does not nerf damage potention, then movement HAS TO be nerfed.
Other options include, nerfing damage potential (without nerfing agro generation on "tanking" skills, so tanks can still hold threat), in that case "heavy armor" can offer better protection, good agro, good movement, but lower damage done.
-- skill "deep wounds" can produce 200 damage and 100 threat
-- skill "deep wounds" can also produce 20 damage and 100 threat, just by using different threat modifier, so base damage of skill can be completely irrelevant for threat generation.
Other options is to not nerf anything, but make heavy armor not offer "better protection" overall, only the different kind of protection.
There are other options as well, it just all has to be balanced. Some examples were written in my post.
Those examples are not to be taken out of context, but of course, assumption is that they are used by balancing other stuff around them as well.