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First thing that comes to my mind is: a friendly URL in a email body that doesn't get clipped or mangled in such away that it can't be easily opened.

Ease of use, probably.

Now every private room is by default secured with a password, I think.

Zoom has clearly focused on UX above all else. This explains both their popularity and the security issues that have recently been uncovered.

> Was there any rational for them doing this?

Conference ids are numbers for easier dial-in?