Why ChromeCast?
Unless the new one is much better than the first ver.
I installed the first ver. and uninstalled it because of hit and miss connections. That was at least 2 years ago.
Biggest reason is that you can use a mobile device or computer to send videos from the internet, or local storage, to your TV.
I still have my original two, and for the most part they work well enough, I guess because they’ve had firmware upgrades since then.