That's weird, when I open a meeting link (which would open the native client) at the bottom of the page it says "If you cannot download or run the application, join from your browser.".
I have the native client and it still shows me this option.
The visibility of this link is disabled by default unless the person trying to join attempts (and fails, even if deliberately) to download+install the client at least twice.
I have the native client and it still shows me this option.