Most of the time the only preps warriors can reliably get to use against heavily-prepped mages are stoneskin and protection. And yet these can be stripped by mages in a round or two easily, regardless of the level of stoneskin/protection you use. (I used lvl51 stoneskins consistently, and they were almost always removed on the first dispel attempt)

In normal situations I know you can run and prep again and again. But what if you are in the middle of a raid where you often don't have the luxury to do such a thing?

On top of that, mages also get word of recall, aren't they a bit too risk-free and intimidating at the same time?

What are your thoughts on this?

Resistance
Spellbane

Warriors can choose specs that let them lag magi. They can take a legacy that lets them recall from combat. They can make a Mage use wands and keep withdrawing. Play both and see how people counter your tactics.

Nope.

In that case, what your prepping bought you (at a minimum) is a round the mage/shaman spends dispelling you instead of doing something that kills you.

If you're a warrior who can prep, then you also have word of recall.