Either you're engaged in some large-scale testing operation and your automation already handles it, or something has gone terribly wrong and the inconvenience of the sandboxing UI is the least of your concerns.
No, the point is that the amount of friction you can add to new app installs is much higher if you don’t optimize it for the unlikely case that your user is an app reviewer.
No, the point is that every time your computer isn't doing something you want it to do, you should be able to download a software package to make it do that.
Either you're engaged in some large-scale testing operation and your automation already handles it, or something has gone terribly wrong and the inconvenience of the sandboxing UI is the least of your concerns.