right, but when we talk about tanking, a fact is that you need tools to :
1 generate and keep agro /gather the mobs
2 high defense to lower the pressure on your healer at best
this is universal, if you are not able to do it properly and someone else with better spec/skill can do it then ur screwed.
ofc both points are important and i put point one as a priority because if mobs are running around in the middle of your group slaughtering everyone you will not be able to tank anything anymore
secondary point is important, as if your healer can't keep you up the situation describe above will happen anyway
ofc i reckon i could have done better in the tanking in BK and spec is not the only difference. player skills also is to be taken into account. but if you lack the tools, you need more skills to be able to compete... i just realise that i was not able to gather up the mobs so i need to figure out how to solve this point, either with a new spec or with playing with the tools already existing one the other spec i had
when i tanked in DM it was np including the final boss eventho we had a quiete eclectic group.
i see your point tho and agree that their might be room for creativity at 50... but if you fail either one of the point above mentionned you will most likely wipe...