Are Apple PDEs (Printer Dialog Extensions) a Legacy Technology?

As the title says I wonder if PDEs are still supported in Mac OS or if there are alternatives to accomplish the same function. In the current Apple documentation I have not found anything relevant to other than old code examples. Anyway Looking at the printer drivers of various printer manufacturers (at least on Mac OS Catalina), it seems that PDEs are still widely used in Mac OS. Any hint to the correct documentation would be appreciated.