A moment where version numbers are relevant is when you collect telemetry from your users and when you reccomend supported browsers.
I think it is in part a difference between websites oriented to the public and websites oriented to companies, where browser versions can be more complex than a self-updating browser.
Sorta. Though in that case, more versions is more better - it gives you more precision on the up-to-date-ness of the browsers people are using. Rather than saying "80% of people use a browser from between 2016 and 2018", you can say "75% use one from late 2018".
