Apple plans to sell video subscriptions through TV app

Bloomberg:

For the first time, Apple plans to begin selling subscriptions to certain video services directly via its TV app, rather than asking users to subscribe to them through apps individually downloaded from the App Store, according to people familiar with the matter.

And:

Right now, the TV app aggregates content from other providers, allowing people to locate shows from a wide array of apps and channels like ABC, NBA League Pass and HBO, rather than having to hop between different apps. But then Apple sends customers outside its app to buy access to those channels or watch shows. With the pending change, subscription purchasing would move to the TV app. Apple could eventually move the streaming to its own app, instead of sending users to third parties.

Is this an indicator of Apple’s plans for packaging their own custom content? Will everything sit under the TV app? If so, will Apple build a TV app equivalent for macOS? Will subscriptions be manageable from the web?