For some things, it is not that simple. Let's take for example the Push API.
While there are very few web sites where you want them to send you notifications straight to your desktop, that API is also used to wake up your Service Workers, to let them receive information when they are not the currently active website and are therefore quite important to build things like chats or apps that sync over multiple devices.
AFAIK that Push API for Service Workers is not available on iOS yet, which is a major show stopper for Progressive Web Apps as there are many use cases where you would need something like that.
While there are very few web sites where you want them to send you notifications straight to your desktop, that API is also used to wake up your Service Workers, to let them receive information when they are not the currently active website and are therefore quite important to build things like chats or apps that sync over multiple devices.
AFAIK that Push API for Service Workers is not available on iOS yet, which is a major show stopper for Progressive Web Apps as there are many use cases where you would need something like that.