Mobile Safari is open on every single person's phone. Those apps that you listed are the A-list of what everyone has on their phone. That doesn't trickle down t

Mobile Safari is open on every single person's phone. Those apps that you listed are the A-list of what everyone has on their phone. That doesn't trickle down to all the other apps that aren't Facebook or Instagram. Literally no one wants an app for every single site they happen to visit regularly. Hell, I've seen people leave an app and go to the site because some functionality didn't work or didn't exist on the app.