My department has a fleet of about 1000 iOS managed devices. I’m honestly happy not to deal with side-loading. It’s one of the reasons we’re still only on iOS.
Apple’s going to allow sideloading of apps on to iOS but with lots of limitations.
The app developer has to be in the EU, the user has to be in the EU, they’ve got to have been an apple app developer for over 2 years, and to have over a million installs of your app. Plus a ton of other requirements…. This is the definition of malicious compliance: https://en.wikipedia.org/wiki/Malicious_compliance
https://www.theverge.com/2024/3/12/24098334/apple-ios-web-distribution-eu-app-store-changes