I made this comment based on trailers and without playing the beta. They have less impact than I had thought they would, although to me it makes things a little redundant if it's used for a team chat replacement, because you have the ping system (thank you for this system, very much needed in all games imo), it's not redundant to an extent it should be removed, so maybe a thin layer of overlap is a good word for it. TBH the system is working well, better than expected like I said. When coming from CS, I imagined CS with this feature, it'd destroy the game in a strange way i had thought. But it works well here so far. Thanks for commenting and I hope this feedback is valuable to you.
EDIT: A few moments after I had an after thought, the system doesn't seem to be created for hearing impaired like you mentioned, I understand it may help with their ability to play, but the number of sound queues, from ults, to abilities, to reloading and specific gunfire sounds, possibly more...