The biggest jam up in workflow, is, guys with only one mill, now have to group cases together based on shade, multiple disc changes in a day, remills will be a nightmare. Rush case? No problem! Just pull out whatever jobs are running. This will also impact if cases are scanned in by date or shade, how much room is in a disc, it can disrupt a workflow entirely. The stain and glaze is one thing, but I have never been a fan of fighting a pre shaded disc to a desired shade, it can be difficult enough with a dip shade. Oven temps and cycles need to be adjusted as well. The discs are also only available 14, 18 and 22. I use a ton of 10mm. So now I'm paying more, for a disc I don't even want in the first place. Oh, and its 163 MPa weaker. But you're right, its a simple, easy change over.
If there is one thing doctors want, its consistency.