Simply, yes. If you can't defeat a raid boss legitimately you don't deserve the rewards. Don't get me wrong, there are many strategies which can be implemented throughout a raid with no harm. (Cheering oracles, finding a quick route to traverse the abyss, ect.) With that being said, using a method of dropping out of a game and rejoining to change the way the game plays is not okay. It's more than a strategy, it's altering the game. I honestly don't even know how it's done, I have a legit raid group and we run it pretty consistently and efficiently. It really isn't that hard to meet some cool people to raid with.