It’s extremely common to support the two most recent major versions, especially for iOS. It’s great if things work on iOS 14, but it’s been explicitly out of support for over a year in a vast number of organisations.
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.
