Yes and then you need to do magic tricks so your new soldiers could handle next battles to come. And practially you can’t loose your experienced soldiers because you will get punished heavily by the game without those soldiers. I think this is not good way to develop game.
By magic tricks I mean training center in base which can spew out 7lvl soldier just with lower SP count. That is silly. In the end game you can’t take level 1 or level 2 soldiers because they are almost useless in hard combat situations. That is the price of “reward for training”.
And lets not talk about that poor game of FiraXCOM.
Argument about not leveling them up is fantastic. Maybe I should not play the game to not feel that something is wrong?