I’m imagining this being built-in will be a lot more useful if you have multiple android devices. You won’t need to push the APK to each thing every time. Not to mention updating.

I’ve been making a few apps for my Apple devices through Xcode and I basically given up because I have to push the changes every time.

From a user's perspective probably nothing, but from Google's perspective, the benefit is more control. Hell, Google is working on closing down sideloading, so this'll probably benefit them.