We like the tone for accessibility but also have many reasonable complaints raised by those it annoys. Other meeting software does not have the tone and it makes adoption tougher not having a control on this. Here is an example of feedback I receive:
It's unnecessary. No other meeting platform (Teams, Zoom, even Skype!) has a mandatory signal to let us know that we are muted, and we do just fine without that!
It's distracting. Though it doesn't fully drown out the other speaker's audio, it takes attention away from it, which can make comprehension difficult for people with hearing loss and for English language learners.
It's inconvenient. Webex prides itself on being customizable, e.g., I can decide if there is a sound when people arrive/leave, so why can't I customize this basic of a setting?