Screen Sound Sharing Why So Hard

Why is this so difficult? Skype, Hangouts, Discord, Steam. Can someone knowledgeable explain why sharing another persons screen and sound sound simultaneously is so buggy through every program ever created up to this date. 

Discord great you can share sound now but the video resolution and frame rate of games I'm watching my friend play is bad. Skype has fantastic video quality but the sound cuts out and is buggy. Steam is game only game no desktop with a 10 second delay..The list goes on and on. And btw with Discord it only shares certain windows open on the desktop its kinda confusing. 

I'm just asking for years now nobody can make this work seamlessly. Just make it work. Full screen share all windows, games, and desktop. Sound and all, no bugs. Please so I can finally quit switching between all these programs.