In other games 1 MP isn't as special, but in this game you get the option of 1 Mp per spell and two spells at a time. It works very nicely as does genji/offering. Can it make the game easy? Yes, but it doesn't hide the fact that its a nice set up. I remember in FF10 Yuna and Lulu had 1 Mp cost on their weapon but with the fighters it wasn't worth it to me. So pretty much its a nice set up but to some it isn't worth it.
I see the point on how using Osmose wastes a turn. I've been fighting a long time on the veldt and Having one MP cost in my opinion is better then wasting a turn for all characters that need MP. I how ever don't have Economizers on all my characters and to know that Osmose works is a blessing. I just don't diss the economizers/gembox combo at all. Its fast its easy and I can just rely on one character to spam spells. Save the others MP if I need it.