Even if this is small progress the headlines and framing of the story are still doublespeak. Installing applications on your computer is the normal state of things. Walled gardens and not having control of your computer is the new weird thing. The word "sideloading" is a feudal concept and it's unquestioned use is dangerous for society. Properly stated this story title is, "Installing applications on iOS 17 might be…
Even on Windows if I send an EXE or MSI of my software to someone they get a scary security warning that prevents them from running it. The only guaranteed way around that is to be a big company (or a big open-source project). If security really mattered, every OS would run applications in a proper sandbox, but why bother with that when you can just point your Web browser at a program running on someone else's server…
iOS has a full sandbox which would apply even to "side loaded" applications, which makes the arbitrary constraint even more ridiculous as a "for your own good" measure.