Q: Why are iOS and MacOS Mail SWIPE defaults different?

Do the people in different Apple divisions, especially those that are creating products that look more and more similar and are theoretically related, simply not talk to each other.

Mossberg is write when he says that Apples Apps Need Work -- such simple things as having a rightward swipe lead to the COMPLETELY DIFFERENT PROCEDURES in Mail on MacOS as it does in Mail on iOS shows that the current Apple just isn't in it to win.