Instead of the new Export command they have to use the Save for Web dialog, which does offer the option of an 8-bit file – but this comes with a bitmap alpha channel, producing hard-edged cutouts. Users of older versions of Photoshop, however, don’t have this option. This results in a much smaller size than exporting 24-bit PNG files for web delivery, 24-bit images are unnecessarily wasteful.
Photoshop CC 2015 introduced the option of saving an 8-bit PNG with true transparency using its Export feature.
Exporting a PNG file from Photoshop with transparency is a key requirement if you want to place images on a colored or textured background in your website.
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