It's time to retire this dead meme. The most successful SAASes in the world are just websites that people pay for hand-over-fist regardless of what OS they use. Netflix doesn't use Liquid Glass, Spotify doesn't bother. Google Docs isn't going to inherit it and probably neither will Office 365. Websites online by-and-large won't adopt this design either.
The ideal of everyone taking the time to make a sexy native UI is appealing. But it's never going to fully be realized, especially when OEMs resist basic A11Y obligations and insist on battery-draining eye candy.