I think he is right, magic should not only be about how much damage you cna make imo i think , for example if you are a master mage [lvl 150] you should be able to cast the realm 1 spells no problem, they should be fast, however weak, but the realm 5 spells should take a lot longer to cast and more mana, but stronger, and about how far you can cast it, i think it depends on the spell you cast, for exxample if it is missiles you are casting they should be cast pretty far away, but if it is somethin glike flame burst, not really as the flame you are casting on it will probably dicintigrate before it reaches its target as you are casting it pretty far away [unless if as we go up the realms our fire gets bigger]
Also if we have maxed CW for example the life infusion healing should be able to be cast much faster, but heals less the healing flsh however, takes a long time but heals a lot more