Feedback is a valuable tool. While you do not get any follow up and it seems you are not heard, they are read. There are many examples of requests by users that have eventually found their way into updates. Some examples include adding features to the calculator app, larger emoji sizes in iOS, Dark Mode for eye strain, RCS Messaging, and many Accessibility features.
I do now understand your meaning of "stock" apps. There may be a change in the future, but not sure what that would look like and the effects on security. As you know you can't go to a website and download an app on iOS or allow apps to be installed to launch on startup, or even assign users with the ability to access certain files like you can on the Mac. The Mac has much more flexibility and currently the only way they have protected the System is to package the installation including "stock" apps into the Read Only partition. I am not saying it is impossible, but would suggest that the vast majority of development resources are simply allocated where the majority of sales come from.
I understand where you are coming from and don't disagree with you at all. Just not able to jump aboard the conspiracy train that many follow claiming it is due to force us to upgrade storage requirements. I would suspect there is much more to it than that.