I&#x27;d think there are plenty of reasons to give software an air of &quot;out-of-date&quot;-ness. In this particular example, its a stigma to browser developers if it takes them until 2023 to implement ES2015.<p>It&#x27;s a common thing in language standards to version by the year the standard was ratified, especially for ANSI languages such as C and C++, but there&#x27;s a long history of it in language design including the ur-example off the top of my head of ALGOL68.<p>As for Windows 98. Would you seriously with a straight face want to admit to using a version of Windows that is old enough to vote? If anything, it&#x27;s too bad they stopped that pattern with XP as it would have been a lot easier to shame people for still using Windows 2001 in 2015.