Worse audio, often worse visuals, can’t pause if I need to take a leak, and going to miss something important because some asshole in the front is on his phone.
This is why I own a high-end projector and a badass sound system. The stereo and speakers are for music first and video second. It’s not convenient as I don’t have (or want to accommodate blackout curtains), but it’s the best movie experience hands down for ^^ these reasons.