No Master-Detail app template in Xcode 12?

Xcode 12 (now beta 6) has one 'App' template for new projects where earlier Xcode versions had three: 'Single View', 'Master-Detail' and 'Tabbed'. Why?

I expected to find this question already asked and answered, but searching here and elsewhere (Google) gets only irrelevant hits. What Xcode 12 documentation I can find makes no mention of this change. There is no "What's New in Xcode" in WWDC 2020's videos.

Clearly this is Apple's intent, but what is the reasoning behind it? Are Master-Detail and Tabbed UI designs deprecated? Is there some other (easy) way to create such apps?

Where can I find some documentation explaining this change ... in detail?
Perhaps those templates are outdated, and new are on the way, maybe by the time 12 hits public release.

See this previous thread for discussion on 12 & splitview controllers:
https://developer.apple.com/forums/thread/655195

Xcode 12 b6 release notes also mention SVC:
https://developer.apple.com/documentation/xcode-release-notes/xcode-12-beta-release-notes/
Thank you. This is just the sort of information I was hoping I could find on my own by searching. Now that the link has been pointed out to me, it shows up at the top of my search ("Xcode 12 split-view controller") where it was not showing at all before ("Xcode 12 master detail missing template").
No Master-Detail app template in Xcode 12?
 
 
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