I agree. As long as you don't intentionaly take advantage of remixing them, its totaly OK, and even remixing them is not something realy bad.
I look at it that 687th peasant batalion which has 100 year history and run from many battles will run with much higher confidence (even though only banner carier survived last battle) than 688th peasant batalion which is fresh. (Don't take me serious, but you know what I mean)

PS: this is not irony