Re: It's impossible to play with this audio.
Apex is using the Miles Sound system,which is also used in over 7200 other games to this day, according to their website. The same site states this: "Designed for the game Apex Legends, we worked to handle an absurdly complex soundscape, with tens of thousands of audio sources and events required by a game of this complexity and polish!".
What does this mean? First of all, a very complex system means that some bugs are very difficult, if not impossible to fix. Then, the issues of the sound engine and tools aren't handled by Respawn, but by the devs of Rad Game Tools, the owners of MSS. Respawn can only try to work around the known issues and limitations until RAD devs come up with patches.
So, fixing audio will continue to be a very slow process. Some of the bugs will probably stay with Apex forever, regardless of how much cash or manpower is poured into the development. You have to get used to this reality.