User blog comment:DaNASCAT/Technical Update: August 15, 2016/@comment-24053170-20160816052102/@comment-24053170-20160816193117

The problem is, that without it everyone has to add the infobox information by hand now. While you can still make pages and everything you can no longer check to see if you have made any mistakes or if the image shows up until after you make the page itself.

Which causes users and admins a lot of extra work to fix any mistakes that might have been easily noticed if we could use the preview page.