I don’t really see this about a comparison between modular synths vs laptops. It can be anything vs laptops. If your playing a laptop gig, all I say is do something interesting with the visuals because looking at a person hiding behind a black square is not interesting to the audience.
For example, put the screen flat to the surface and stand up or project the screen behind you so the audience can see what you are doing. The same can be said hidden behind any piece of music instrument that prohibits the audience viewing, such as a modular - the audience want to know what you are doing.
As soon as you have flipped that laptop screen up, you have created a barrier between you and the audience. Even before you have started to play, the audience already have preconditioned ideas about what to expect - ie “he’s not really playing live” “he’s cheating” “oh, it’s laptop gig, I thought he was bringing his Serge” “it’s not a real gig, it’s a dj gig”.
I like what is happening in the diy video synth and vector synthesis world. People like Derek Holzer - http://macumbista.net/ and Jonas Bers - https://jonasbers.com/media/
This is Jonas Bers using hacked diy analog video synthesis and a modular.