Apple, in a statement to The Wall Street Journal:
Governments and international agencies world-wide have explicitly advised against sideloading requirements, which would cripple the privacy and security protections that users have come to expect.
I’m not buying it. On my Mac, I have the ability to install whatever I want from wherever I want and I never feel that my privacy and security are at any meaningfully greater risk than when I install apps on my iPhone. It’s the same amount of concern for me on both platforms.
The only thing crippling iOS is Apple’s restrictions on software installation.