They like to make decisions for you, like dedicating a button to their voice assistant that I have no interest in using and doing their best to prevent rooting of the device. Apparently some of their devices even have ads, though this might be more limited to their TVs (I’m on a former flagship which they might have left that stuff off of, so it might affect the lower end phones, too). Apps that I don’t need that I can’t remove (including the Facebook app on the last one I had).