And how are you going to recover mp every 4 battles in a dungeon where the save points are kinda distant (when you'll have at least more than 4 battles, maybe 8, 16, or more between save points)... I don't like to make abuse of recovery items, I usually have few of them in my item lists and they are kept aside waiting to be used in a dangerous moment in a boss battle... The reason for this is just because I don't want to have to mind about how many elixirs, or whatever I have left...
Of course you can dedicate a battle to recover mp using Osmose, but I just prefer to fight freely and don't mind about how much mp I have left, and then recover it sleeping at a save point just if I need it... and then going again to fight without thinking about it...
This way I can even be hours visiting lots of different dungeons and different places without the need of stopping to recover and that makes really nice the journey =)...
And BTW, why do you need so much a relic spot if this game have very powerful stats for the characters?
Anyways... Of course it depends on how you like to play... It depends on how much magic users you use in your party and how do you like to fight the battles...
I, as I said, prefer to not worry about how much of this or that thing I have left and just fight....
I have been playing with parties configured mainly on strength, and there of course I make no use of economizers cause it's not necessary to use much magic, of course I make the use of strength or fighters related relics... But if it is about magic users we are talking about (that is the context in a thread about economizers and gem box) I really think and recommend the use of economizers is a very good option...
Is there something better than having all magics, even the more expensive ones, to cost 1 mp?
If I were to a store and the store keeper offered me all his articles, even the more expensive ones, at $0.1 it would be awesome xD!
Anyways, it's a thing about choices... We choose what we think it's more comfortable for us :B