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A player who uses frost who then goes fire wont do the same damage, much like a healer who leveled as dps then has no clue how to heal.
Fire damage is pretty easy to do, esp against bosses.
scorch x 5, fireball x 7 (depending on lag), scorch x 1. Rinse repeat. Frost raid damage is just braindead: Frostbolt x 1,000,000.
As for a frost mage being able to beat a comparably geared warlock in T5/6..... like I said, wws or it didn't happen. FYI, you don't have to get your whole guild to post stuff. Fire mages even have issues chasing down warlocks due to shadowbolt scalability and frost doesn't do as much damage on raid bosses as fire, by quite a bit.
For those of you who say, "You can raid frost if you want to", I maintain that you can do just that. It comes at a cost. That cost is usually time because you do less dps. You want to do that, have fun. I, myself, raided frost for a very long time but more because I wanted to have an occasional ice block as an 'ohhh crap' button.
The difference between leveling a healer shadow and switching to holy is HUGE, the difference between 1 type of damage and another is relatively small. In classes like paladins, all 3 specs are essentially 3 different classes (same with druids). For mages.... not so much. DPS is DPS. You just use a different spell.