The walled garden Apple has built around their products is majestic but limiting. Settings most products would have by v2.0 may never find their way into Apple's products either because they haven't perfected it or they just don't want to allow users to stray off their path.
The default browser in iOS has been my biggest pet peeve on the iPhone for years. The United States government sued Microsoft in 1998 because Microsoft built Internet Explorer directly into Windows, preinstalled, and used by default. Of course Windows users could change their default browser but most don't. Apple's approach is many times worse and no one cared.
Sounds trival, but here's a side-effect of this limitation:
https://www.amazon.comand opens the link using the Amazon app.
Here it is in action: