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I dislike Medium disabling pinchzoom for mobile devices (user-scalable="no"). I have no idea why they think this is a good idea.

It is to avoid the 300 ms lag waiting for a second touch to zoom.

Why would a text content site care about a 300 msec click delay?

probably to reduce click delay, which may not be a useful thing given that people are mostly reading on medium, not clicking.

The notes and recommend button probably lead to a lot of clicking.