Radials with tubes on supermoto bikes is mainly because they want the grip of a radial but the spoked wheels require tubes.
There is nothing wrong with sticking with the stock Pirelli tires. The Demons are pretty sticky. Once upon a time I think they were the sticky racing Pirelli's. Reasons to switch would mainly be if you wanted a tire that lasts longer. But tire choice is often a personal preference thing. There are tires and brands of tires I prefer and there ones I don't. Everyone is allowed to have their own preferences on that. There is no right or wrong.
There is nothing wrong with sticking with the stock Pirelli tires. The Demons are pretty sticky. Once upon a time I think they were the sticky racing Pirelli's. Reasons to switch would mainly be if you wanted a tire that lasts longer. But tire choice is often a personal preference thing. There are tires and brands of tires I prefer and there ones I don't. Everyone is allowed to have their own preferences on that. There is no right or wrong.