There are reports of poor hear at the receivers end using WhatsApp in my case, but it has been a bit intermittent…
You say Room microphone and you mean Hands Free option I think. If it is better described as a Hands\free issue rather than a Room mic so maybe you could edit the title.
EDIT! I’ve written a fair bit about low volume and echo
I’d add a link here to a similar topic and you may find a moderator will move this post to there.
But yes it is an issue for some but as many owners don’t use the forum it’s difficult to know how common it is, so if it is a bug then it may only happen with certain set ups, Network, Network or WIFI calling,