One of the differences between indoor riding and outdoor riding is that coasting indoors is only rarely something that happens. When you go to the top of a huge mountain in zwift, then you can usually coast back down. But if you are going down a small hill that isn't particularly steep, it's quite possible you will just stop. In trainerroad, they will pause the workout most of the time. I suspect on a peloton bike you can soft pedal and it will effectively coast in zwift or other road simulators. I don't think a peloton is ideal, but if other people are going to ride it and they want a peloton, you can make it work.