Initial-scale vs Maximum-scale

It is mentioned that maximum-scale is a bad use because you are disabling the functionality to use pinch zoom on mobile devices.
But depending on your project, it may be very fair to disable that feature.

<meta name="viewport" content="width=device-width, initial-scale=1.0">

Avoiding maximum-scale=1.0 allows your site to be zoomed by the user.

<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">

This way will cancel the zoom functionality on the design.