What applications in the Apple store are able to function as the default SMS app or the default web browser engine? On Android, I can use Signal for SMS and Firefox for browser engine. On my spouse's iPhone, the iOS applications with the same names are severely restricted in their functionality. Blocking ads, scripts, and tracking is significantly more difficult.
If you believe these are core OS functions, and therefore not subject to competition, Microsoft has a old story to tell you about Internet Explorer web browser and Windows 95 OS.