It's old software, it's not like there was much of a standard on how to apply filters and etc decades ago. Everything was a one off attempt to get the job done.
And even today everything about audio / video chat is wonky.
I'm always trying to figure out what application is using what audio or video device. Is the OS messing it up or the application or what is any given conference app choosing to use today ....
It's bad when Lego Star Wars is onto it: