you can use dispel, but then it turns out that you need to wait for the enemy's turn, which is not always acceptable (Dispel Magic won't hurt a Fireball)))...and the opponent won't always give you time to apply it if they slow down and shoot your slow units with archers...
for example, if we take all spell levels, the 3rd level is one of the most ambiguous.. specific spells are found there that are almost never used in ordinary battles with neutrals (earthquake, antimagic, etc.)...however, there is also protection from earth (I almost never use it, I play as Rampart and level up the resistance skill... combined with Tactics, I use "harmful" spells much more often than "useful" ones)....
I would like to know - does anyone actually use this protection? Does it provide a tangible advantage?