As an emergency back up to finish a job is one thing.. then the laptop or smart phone would make sense.

But if you actually play an instrument, there must be some self satisfaction in playing that instrument.

I cannot see myself wanting to perform or entertain without a keyboard... My first preference is to be satisfied by playing. Vocals are not even my consideration (average). I even rather not use arranger features or limit parts when I do.

I don.t see failures with most top equipment, so no need to worry about back up... Worst scenario... I go home

I think I will leave the Karaoke path to the girl acts , where they don't play an instrument, or maybe a solo instrument like a flute.

This idea of carry light or sparse equipment, and little effort...is just for the money.... and that is not me.