If Mac went touch enabled, the expectation would be that iOS apps would run on Mac. Currently they can’t. Likewise, they would somehow have to work convincingly in that environment. They don’t or wouldn’t because they’ve never been designed to work that way.
Interesting piece.
Per Button

iOS apps used to only run on iPhone. They were not designed to work on larger screens. Then iPad, iPad Mini, and iPad Pro came out and developers started to optimize their apps for those screen sizes too.

If OS X/macOS was touch-screen friendly, app developers would optimize their apps gradually to work from iPhone to iPad and MacBook and beyond.

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