Luckily, most people aren't as hindsighted as you are and play the game to have fun first and think about maximizing their effectiveness second. I mean, I'm all for playing your job perfectly and know the fights you're in, etc etc, but playing a different job that you may or may not like just because it's a slight effectiveness boost? Are you that desperate for efficiency that you need that?
Not to mention that nobody knows how SMNs will be in 3.0, so stop assuming things you don't know