[itissid]

Is there a good technical article for why casting has become unreliable over time? Is there like an issue with standardization across Manufacturer's APIs or is it more of an issue with Client SDKs being spotty in implementation?

[nickburns]

The former. AirPlay and Google Cast (and Spotify Connect for that matter) are not actually standards at all. They're proprietary protocols subject to change in ways and for reasons not publicly known nor disclosed. But it can typically be safely assumed that any/all changes are made in order to maximize profits.