I spend most of my guitar practice time sitting around with the archtop or an unplugged electric guitar, but before I play a gig I always try to plug in and turn up.
Any practice is good practice, but the guitar reacts differently to your playing when you are plugged in vs unplugged and it’s important to practice with your amp before you get to the stage.
When you get on stage and turn up full volume, the guitar can feel almost out of control if you haven’t been practicing the same way you play on stage.