You mean like how it is already with the Mac and Windows PCs or pretty much every other electronic device?
No. Ever since the App Store opened, people have come to expect Apple has had their back that apps have been thoroughly vetted for privacy and security attacks. With many thousands of submitted apps being rejected for those reasons yearly since 2008.
Most of the 1 Billion+ iPhone users aren't as tech-sophisticated as you and everyone here. They're just regular consumers (store clerks, librarians, police officers, real estate agents, school teachers, and on and on).
As a result, in the future when they side load an app, they're going to assume it will cause no harm because that's the way it has been for the last 16 years downloading apps from the App Store with Apple rejecting those many thousands of nefarious apps.
Sadly, that won't be the case. Thus Apple needs to educate and let people know that side loading presents potential risks to the user's privacy and security, and expecting the user to take an extra one second to press the Acknowledge button to proceed.
Not a big deal. Though I expect many here will feel very put out having to press that button.