Chromecast built-in

I've been having major issues with the latest version of this app. I use an Nvidia Shield TV, and I'd been unable to cast to the device in multiple apps. Youtube and HBO Go would both regularly fail to show content. The only fix I've found has been to uninstall the latest update for this app. Once I do that everything works great. Clearly the latest version has been hosed, and needs to be fixed.

On my Sony TV, the factory installed version (1.47.216070) I couldn't get many websites, most notably Netflix, to successfully cast from Chrome off a laptop. The dedicated app for said site would attempt to load (three pulsing red dots) and then fail, crashing back to the home screen. With this update, that's not even an option -- trying to cast those sites that previously failed now instead triggers Chromecast Mirroring for that tab...which also frequently fails. I don't understand why this experience is so much worse than with a dedicated Chromecast device.

Chromecast built-in is broken. App casting like YouTube and Netflix works because you can get around it by having the same accounts, but anything on the local network wont work. Philips 43" (43PFL5604/F7) casting doesn't work after uninstalling the updates/forcing an update/ rebooting/ or factory reset. I've spent 2 whole days trying to get it to work with nothing. Chromecast (2 hours in a text conversation and 1 hour in voice call) or Philips (1 hour in voice call and 2 hours on hold collectively) support doesn't even know what the issue is. Hoping that the next major version of Android TV the issues