Browsers are supposed to be as unopinionated as possible since they are browsers, not mediators, and their job is to implement the standards of the web.
Safari also won't show "www" until you click on the location bar, but it'll show once you click.
* Chrome encourages you to sign in to the browser with a Google account.
* Firefox's new tab page shows stories and articles from Pocket.
* The news feed shown by default in Edge provides stories from MSN.
No similar argument can be made about disabling "www." It is purely an opinionated decision amounting to "you don't need www" - assuming it's not a bug, of course.
Is there a standard saying how the URL should be displayed in the toolbar?
https://www.aishitei.ru vs https://aishitei.ru vs https://kimiwo.aishitei.ru
I never set up a www cname, but now unless you're paying attention (or actually reading error messages) you might not notice that the reason it failed is because you're not at the domain but on the `www` subdomain. The URL bar doesn't convey this information until you click it and then it shows the full URL.
It's really minor but I also don't see a good reason to do this. All the sites hosted by the company I work for are hosted on `www.` with the intention that it "looks more professional".
Is it really a big deal if you serve the wrong content 1% of the time?