It would be very nice if phones put that feature front-and-center. My guess is that they sideline it so the web can't compete with their native apps.
Apple is way worse in this regard, but Google is still incentivized to keep at least PWAs from being first class citizens on Android because they don't get their app store sales cuts or microtransaction money from them. And at least on Android you can install other browsers.
People consider the hegemony of Chrome to be the premier threat to the open web but I keep feeling iOS Safari is the real drag. Apple is so heavily incentivized to sabotage web tech that could encroach on their app store revenue.
I can’t install any adblockers on my iPhone, the best is Safari which has some built in anti-tracking but that’s it.
https://developer.microsoft.com/en-us/windows/pwa
I find it all oddly ironic. Remember back in late 90s - early 00s, Microsoft was generally hostile towards open web and the (then only just appearing) web apps, because that undermined its desktop app monopoly? Here we are 20 years later, and now it's Apple and Google protecting their turf on mobile, while Microsoft is promoting PWAs to entice the mobile devs into supporting Win10.