While we confirmed multiple times we WILL make this optional, I want to explain WHY there are lots of audio cues now.
The GSX menu in MSFS is a Javascript Toolbar addon and, the way Javascript works, for performance reasons (it wasn't like this before, this change happened in SU5) the moment the menu is closed, its Javascript code gets immediately killed. This causes a series of issues because:
MSFS Simconnect doesn't have the quick Text messages function anymore, what used to be the top green bar, so we replaced it with a Javascript function, which calls into the Tooltip system so, it's the new "proper" way to display short text on screen.
Putting these two together, and the result is that, when you close the GSX menu, you will MISS all text GSX will try to display, leaving you only with the "beep", and sometimes it might not be entirely obvious why GSX is beeping for, so we added all these voice cues so you'll know what GSX wants, even when the menu is closed. Yes, of course this function is more useful for NEW users, or maybe even old users that haven't used GSX in a while, but I understand why you might want to disabled it.