Sharing Appleid and iCloud accounts
My wife and I share all computer services, calendar, contacts, email, documents, photos, etc so only use one Appleid and iCloud account. I keep reading that we shouldn't do that although I don't understand why not. What are the adverse consequences of sharing these and if we set up individual Appleid's and iCloud accounts what is impact on items we currently share and want to continue to do so?
iMac, OS X 10.11