My previous employer got me a new macbook pro and every couple weeks I either lost a dongle or it broke. The cheap ones are really fragile, and the better ones still not great. If I had only one machine, or all machines took the dongle, I probably wouldn't lose so many at least.

I do use a mech portably...I like to carry one in my laptop bag and set up at a picnic table at a nearby park. I'll use the built-in keyboard for light work but with heavy typing I need the mech for ergonomics.