A critique of Safari's influence on the web
Lately, it feels like more and more news publicly attacking Safari appear in Hacker News.Safari either isn't attacking, protecting or killing the web. It has a different purpose.Apple's main objective is to sell services and devices. iPhones, iPads and their accessories. Also, Mac laptops/desktops.As most of us know, they use their Apple Store, with a 30% cut for every transaction to sell their services. If a company doesn't like that they end up in court (Epic vs Apple) or getting special conditions under the table.Safari is another piece of the iOS/macOS ecosystem to browse the web. They don't have any hurry to implement fancy features like Midi, Bluetooth, Notifications, proper PWA support, CSS rules, JavaScript. 
After all, you should have access to those things if you submit your app to their Store and accept their cut.
They implement the features they find interesting or important and that's all. Even the release circle is slower than other browser implementations.
Obviously, allowing other engines can hurt their services division and that's why the alternatives use the provided WebKit on iOS as enforced by the ToS.As a user Safari is a bliss, but as a web developer is sometimes a pain.Maybe we should stop supporting Safari on web applications which require non existing APIs with an encouraging message to try Chrome or protest to Apple if you're on iOS.