Why SO3 had to ruin it by adding in "MP death" is beyond me...
Everyone knows that in battle systems similar to Star Ocean, every magic user except one is worthless. So this was their way of dealing with the problem since stronger physical characters have less MP. In a way it works, but there is still the main set of characters who are always better than the other party members in the game. You almost start the game off with the best characters, so it's almost pointless to use anybody else if you have to. Plus battles end in less than 10 seconds, so there is no endurance involved in the game unless you get into the optional battles.
Also man SO1 is like THE WORST when it comes to lying to you. You don't go into space AT ALL except for one scene in the beginning, and there is one space factory dungeon at the end of the game. Even Chrono Trigger has more futuristic elements than that game. I don't get it.
I don't know what the guys were doing when they left Namco to make tri-ace after Tales of Phantasia. They had a great idea to make a sci-fi JRPG since it was a pretty fresh idea at that time. It feels like they had the first hour of their true game come out, but ran out of ideas and went back to their "Tales of" formula.