aramis erak
Legend
The difference is that wizards are almost totally reliant on daily spells. If a fighter loses an opportunity to use the Great Weapon Master feat, who cares? He can use it again the following round or the round after that, or the encounter after that. He only loses the opportunity, not the ability. If a wizard casts Web and then gets hit by an arrow and loses the spell, everyone in that Web spell is now free AND the wizard lost the spell slot.
Clerics and Bards have limited spell slots too, but they also can just go up and fight a foe in melee or with ranged attacks. Them using up a spell slot does not use up the same percentage of potential of the PC.
Spells are pretty much everything for a wizard. They have lousy AC, lousy to hit, lousy damage, and lousy hit points. They can have some cool special abilities in combat, but most of them are still related to spells.
If a spell is wasted, it is a much bigger resource lose for a low level wizard PC than if an at will opportunity or encounter ability is lost temporarily by another PC. So yes, the loss of the plan when a wizard has already cast a spell is more of a loss. D&D 101.
That doesn't sound like 5E at all, KD. You're letting prior editions' truisms derail you again.
5E wizards are capable of the same to hits as clerics or rogues. They have a poor selection of weapons without penalty, but are just as competent with them as the cleric with his wider selection. And the armor class? Most of them are running 14-16. (Mage Armor and dex). Plus, with cantrips, they can keep zapping for damage just a little lower than a fighter of same level...