Serious inquiry about offline mode

This is not a rant, this is a serious question.
If im only solo player, i pick CoF everytime because i simply find it more appealing, is there anything, except for cosmetics and pets (which i hope will be added to offline at some time), that is available for online cycle compared to offline cycle?

Just the feeling that you’re not playing alone when walking through a city. It sounds minor but after a week in offline mode I start to miss seeing other players.