I don't want the answer to everything to be "Buy a dongle". I have a similar setup at home to my work setup, almost identical - do I need another dongle/hub for

I don't want the answer to everything to be "Buy a dongle". I have a similar setup at home to my work setup, almost identical - do I need another dongle/hub for home? I also work from my parents house if I'm visiting, they have a monitor I use, and my girlfriends parents (again if we're visiting) has a dual screen setup in their office I can use. Do I buy a Hub/dongle for each location? Do I carry one with me at all times? (Good job they made the laptop light as I'll now need 38kg of adapters). Oh wait, I don't have any of these problems, I just take my 2015 MBP and it plugs in to whatever is there. Nice.