14.3 seems more like "try to degrade gracefully" old rather than "won't support" old...
The web has a pretty different set of expectations, one of the reasons for its success.
Take a look at the defaults for browserslist, for example:
https://browsersl.ist/#q=defaults
It just barely supports Safari 15, on iOS only, and that’s likely to go away imminently because it’s under 1% usage.
Browserslist is used by a huge proportion of web developers and the tools that they use, with millions of downloads a week. It has nothing to do with native apps and everything to do with the web.