Unless, of course, you need apps for work or for personal use and the developers pull out of Apple's app store. Then you will be forced to either go without those apps that you need or use insecure sources. And so much for logging in with Apple's nearly anonymous ID to apps - all those companies will have your personal and credit card details.You will not have to side load.
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The EU would have been wiser to make Apple (1) warranty apps for quality and security and (2) stop the practice of using arbitrary or anticompetitive reasons for banning apps from the Apple's app store.