PWAs are the primary way for small busineses to have internal private apps for running staff services on local devices. Apples App Store has way too many hoops to jump through and has far too high a wait time to publish for businesses to move fast and update internal apps with bugfixes and new services etc.
Android accomplishes this by allowing devices to connect to private app stores and repos, which enable companies to issue their own apps on their own terms.
As Apple plays hard ball on this front, the only way is to use a PWA.
Custom apps published for internal use by companies with fewer than 100 employees who aren't eligible for enterprise app distribution sounds like a niche of a niche use case, so it's pretty consistent with my view that they're more developer catnip and not a serious technology.
Your point was PWAs are necessary for small businesses to distribute apps. I just spelled out what that meant, since businesses with >100 employees can just use enterprise app distribution on iOS.
I would personally say that the barrier to entry for Apple enterprise app distribution is very very high, and requires so many hoops to be jumped through that it would take a much larger company than 100 staff to warrant that
Android accomplishes this by allowing devices to connect to private app stores and repos, which enable companies to issue their own apps on their own terms. As Apple plays hard ball on this front, the only way is to use a PWA.