Kaboom!

[TaiDaishar]

There is a 'Time Bomb' like curse that a boss in Molten Core can cast.  Not having been in MC I don't know the particulars, but I believe it is something like "After x seconds curse causes AoE damage of xxxx to friendlies".  Generally this is not an issue, as you have mages assigned to removing the curse, and the amount of time is in the 20-30 seconds range, so there is generally plenty of time to get the curse off if the raid party has any brains.

Curses and de-buffs not being removed by dismissing pets was a purposeful decision, as a Warlock with the right talents can re-summon in 0.5 seconds (once per 15 minutes.)  So if your pet got a bad curse or other negative effect, you could potentially dismiss and re-summon instantly without the negative effect on your pet.
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I believe is a person invests his talents in being able to do that, let him do so, it's only once every 15 minutes not to mention the huge mana drain needed to summon pets and most of them take soul shards to summon.

I really don't see the issue of stop debuffs/etc' when a pet is unsummoned (at least Warlock pets) but on the other hand, the act done in the video (which was hillarious) has major potential for abuse