The problem with this is that you'll never get every 3rd party service to support it. Everybody I've talked to who had a Windows Phone really liked the OS, but

The problem with this is that you'll never get every 3rd party service to support it. Everybody I've talked to who had a Windows Phone really liked the OS, but with so many apps missing compared to Android and iOS it was dead in the water. PWAs could bring some improvement here, but there are also plenty of services (ie Dropbox) that are essential to people and need to be integrated into the system more than that. The moat of 10000 other companies saying "we already maintain our app for two platforms" is basically insurmountable to new entrants.