Tor is not enough for Bitcoin privacy as it only helps against network analysis but not blockchain analysis. But this should be the default way of using Bitcoin, that's why I'm currently suggesting either Electrum (PC) or Samourai Wallet (Android) as the wallet software for the new users (nothing good supporting Tor on iOS currently AFAIK). And then on top of that there are various techniques, like CoinJoin, to make Bitcoin transactions less trackable.