Perhaps because until recently, battery life has sucked? I used to plug in my laptops all the time. Now with the M1, it only gets plugged in to charge, then I don't plug it in until I charge it again. I have been enjoying sitting on my couch when I want to, to get work done rather than at my desk.
You can sit on the couch and have your laptop plugged in. I also don't keep my lenovo plugged in all the time and don't notice any battery issues. Realistically you're not sitting on a couch, working for 6 hours straight either.
