Should use macOS's built in PiP feature

Sometimes there's some one streaming something on Discord and I also want to keep doing what I'm doing, macOS provides a built in API for PiP, Discord should use it to allow PiP to work on streams and also on the built in YouTube player. Sometimes I open discord on the browser just so I can use PiP, but the experience is downgraded.

Also, why can't we share audio when streaming on macOS?