Grifthin said:
Your fighter comes up to wizard to kill him, wizard casts charm - asks fighter to please go and buy him some cookies 2 cities away. Fighter says OK! anything for his best friend. Wizard carries on with his work.
That's silly. First charm wears off fairly quickly. Second it only tends to force the person to act as friend. So he can end being beat into pulp and tied up instead of killed. While he has work here to harm the wizard, he might allow the wizard to move away. Going to other city for stuff alone would be absurd. Do you know how long is that trip, he might force the wizard to accompany him. Of course P3 charm is something else, the fighter would jump at his companions, for a while.
Look at this example:
Demon said: I can cast weakness and you would be laying at my feet.
He cast weaknes.
The third character lay at his feet because she wasn't able to support her body.
The second character was protected against low level spell like weakness by her armor.
The first character stood firm weekened and said "So when you will cast your spell show yourself."
"I just did."
"It did nothing to me, you piss me off." Well when a character can lift 10 tones a decrease to 1 tone doesn't really matter as he can beat the crap out of you anyway.
Or another example.
A princess attacked main character with a sword, the main character deflected the blow which flew out of princess hands and pierced her heart.
The main character: "I'm sorry. I didn't mean to hurt you. (Actually I sort of want but not kill you.) "
Princess: "It's just a flesh wound." Then she ran away with sword still piercing her body. Yes it was just a flesh wound she survived and healed it easily.
A bonus points for person who would guess from where are these citations.
Basically you are talking about a mage who risked his live, sanity, and spend a lot of time to learn fairly complex things. vs a person who was avoiding to learning magic and is somehow similar to an army general.
When you would start to talk about people that modified theirs bodies to be able to regenerate wounds as trolls, and have strengthened bodies above what common person can get by a training, you might talk about something comparable.
Honestly why these warriors you talk about didn't learn at least few levels in Mage, they would probably have slightly less skills with sword, but they would learn few spells, which might save theirs butts.
To cite strongest disciple Kenichi. "Yes I'd be able to do the same extremely hard and painful training as him (for negligible increase of fighting skills), but I'm too lazy."
Fighters are often too material. Wizards are sufficiently crazy to try.
Or perhaps we can use common logic. Should a fighter be able to defeat a monster who learned all skill fighter has and more, has more strength and durability, better armor, and know magic spells? That would be absurd isn't it. A mage on other hand might have a slight chance, so the monster will not be willing to risk his hide.
You played too many games that pretended to be beat them up, you might like to play some RPGs.