Explore did not originally allow you to click through on a ticket id to a ticket. There was a workaround, that involved creating a custom attribute, and turning on html interpretation, to get this end goal. We set up a ton of reports with it.
Zendesk then fixed it so that the attribute "Ticket ID" can be clicked. Except now tons of reports have the old one still, and new reports don't. We can't delete the old one unless we manually update every single (something like 900 reports) report.
It would be great if Zendesk released a way for us to swap the old workaround attribute out anywhere it was in use, with the supported, Zendesk created one. This makes reporting more convoluted, adds to the clutter of custom attributes, and has to be explained every time someone joins the team.