It's obvious you are not a web developer using HTML5/CSS3/ES6. iOS has became the new Internet Explorer hands down, and now it's the first platform I test on to check for compatibility issues (as it's the one that normally gives those issues).
iOS is a significantly easier support target compared to Android due to how much of a stable target it is. Android is a bit of a 'which Android?' when it comes to browser support.
Maybe the confusion is that Chrome =/= Android Browser
WKWebView is a mess just like UIWebView.