So how many decades will it take for mobile computing platforms to resemble their desktop counterparts, because its been nearly two decades since the iPhone was initially released, and people are ready to be treated like adults and not be contained within a walled garden.
Maybe I don't want mobile computing to resemble their desktop counterparts, because in my opinion, it would actually represent a step backwards. To me, it's not about being treated like an adult, but respecting one's choice to "not have a choice" by way of actively voting with your wallet and buying into the Apple ecosystem as compared to Android. Openness and complexity is not the selling point here for me. Simplicity and ease of use is.
For starters, I own both an iPad and a Mac (2 actually), and so I am happy that my iPad is different from my Mac. I honestly have zero desire to run macOS on my iPad.
Second, not being able to sideload also means less risk of being tricked into downloading malware via scam ads and then being fleeced of your life savings.
Third, I maintain that having all your apps in one central App Store represents the greatest amount of good for the greatest number of users, compared to having to install and manage multiple app stores.
Fourth, I wonder how the developers pushing for more freedom will feel when the tables are turned and their apps end up beng pirated aggressively. There is a few reasons why developers generally make more money on iOS. One is that piracy is much harder on iOS (especially with Apple cracking down on jailbreaking), so people who want apps often pay for them the honest, good-old fashioned way. In contrast, one commonly-cited reason for wanting to sideload on Android is the Revanced app, a third party YouTube app designed to block ads (as opposed to simply paying for YouTube premium).
IMO, the real conversation can only start when people stop positioning features like sideloading as basic rights or must-haves, while sweeping every legitimate concern under the carpet using the motherhood statement "you don't have to sideload if you don't want to". At the end of the day, everything is a tradeoff. Even freedom. I chose the walled garden because I believed (and continue to believe) that the pros outweigh the cons.