I would also add magic balance to this list.

When I was at Valenok's wedding, Kostya (Dirty Player) and I were just discussing magic balance. And Kostya sharply spoke out against moving Town Portal to fire magic, because it is already a very strong element. If you think about it, fire has a wealth of useful spells, both for use against neutrals and against a live opponent, but their application simply requires a higher skill level than for earth. By reducing the imbalanced nature of the element, so to speak, for noobs (earth), we ended up with an equally imbalanced fire, but for more skilled players.