Sideloading apps used to have this nifty word called downloading. They made it seem like anything not from the App Store was dangerous. Just like when you download an app on your computer they’ll ask you if it’s okay and sometimes you’ll have to go into settings and provide permissions to allow it to download. Will you be able to download some silly shit? Yes. Can you download harmful stuff. Theoretically yes. But is that a problem on macs? Not really no. What it does allow you do to is go to the source of a program and downs load it from them. You can download things apple deems not what they want in the App Store (ad blockers etc) it also allows potential developers to sell apps to individuals without the App Store tax. It’s not good or bad it just is the way it’s always been on a computer. So why not at least allow it with warnings like on mac.