I agree that it would be better to eventually remake all old Autocad details into Revit native detail objects.
But that doesn't mean using an Autocad detail here and there is going to guarantee career failure for somebody.
Some companies have hundreds of Autocad standard details in their library, and plenty of them never need to change even if the Revit model does.
I don't make them myself, but I've seen plenty of details that are kind of generically drawn, where non-critical dimensions are just labled "SEE PLANS" or similar. Concrete spread footings, for example, are almost always like that. The important bits are the 45-degree chamfer and the reinforcement shapes, but only one detail is used and the footing size and thickeness are just called out as "SEE FOOTING SCHED." There is nothing wrong with that. You don't NEED to have several different live footing details that you re-create for every project.