If the basement is conditioned, the primary reason would be to help with soundproofing.
Insulation between conditioned walls or floors is not really necessary as you should be keeping the temps in the conditioned spaces consistent.
Look up about air sealing and insulation and insulate the basement walls properly along with air sealing the ribbon boards and the basement should be nice and warm at that point.
Insulation between conditioned walls or floors is not really necessary as you should be keeping the temps in the conditioned spaces consistent.
Look up about air sealing and insulation and insulate the basement walls properly along with air sealing the ribbon boards and the basement should be nice and warm at that point.