I develop wth a mobile setup (3G/4G + laptop + laptop stand) most of the time, but not with a nomadic lifestyle.

I don't miss big monitors while on the go. Either I forgot how good they were or one get used to it. What I favor infinitely more is the mobility itself. I don't understand why remote people don't move more when given the chance.

YMMV, I still have a big monitor at home, else I would feel cut from my customers' typical setup. A problem with smaller screen is the additional eye strain.