I love the spirit here, but the limitations on iOS are not the limitations of the medium. Mobile computing has lots of interesting and inspiring limitations, we don't need apple to draw artificial squircles we can't cross in an api.
First of all, getting SDKs was akin to console devkits, back in 2004 getting a Symbian SDK was still a commercial only product for example, same for Windows CE/Pocket PC,...
Followed by about 80% tax, only to be listed on mobile phones magazines, with the SMS code to trigger the application download.
Hence why everyone rushed for the garden, it was indeed easier to be creative in Apple land.
Now 20 years later, there is another reality.
I could be wrong, but don’t you need to join the Apple developer program to get the sdk? It’s $100 a year, right?
I know you do to publish apps, which in the us is the only way to get apps to users.