I have to agree with you on the "Do it right at least one time" mentality. Another part of me doesn't like abusing boss mechanics that are clearly borderline exploits because eventually these will get fixed and then people will complain about an encounter being "too hard" or something.
I think this is also why Lost Island (pre 2.0) was so difficult for people to complete. There were no mechanics people could cheese. They had to learn the mechanics, learn the fights, and execute them correctly.
you make a very valid point with the lost isle comment.