For practice, plinking, and non-precision shooting, I'm with you, and don't segregate brass or fail to collect range foundlings for those purposes. Indeed, for shooting plates, dueling trees, presentation practice, moving and shooting courses, and so on, I prefer to use odd, old, or other expendable brass so I can lose it in the weeds
Sounds good to me, the only exception to that is center fire rifle cases. Since I purchase 500 brand new cases for each rifle (bolt action), they are all segregated for that rifle and no I do not mix brands when purchasing cases.
Jim