I think this conflates "ecosystem" with "closed ecosystem" or "walled garden."
I agree that closed ecosystems are frustrating lock-in tactics. But open ecosystems exist - KDE connect actually shows a good example. It was built for the KDE ecosystem (desktop environment, apps, and services that integrate and work well with each other), but makes the protocol open, so clients can exist for Gnome, and other platforms.
I recognize this is mostly semantics, but wanted to call it out because I think the integration and interoperability afforded by an "ecosystem" is extremely user friendly in general. It only becomes a problem when it is weaponized to lock you in.
Yes I agree in that sense, but we both know they don't mean an open ecosystem whenever it's mentioned. Other than KDE Connect I can't think of any other example of open ecosystem.
Google is certainly guilty of killing off lots of products, but:
The video demonstrates the ecosystem working now, using features that have existed for years, most of which work across hardware platforms from multiple vendors, as well as multiple operating systems (i.e. features that won't disappear on Google's whim, because they don't actually control the tech, they leverage open standards, etc).
Let's also not pretend like Apple has never killed a product, service, or feature. Ecosystems grow, shrink, and change all the time. If you prefer one offering over the other, use it. That's the entire point of the video.