Hello, sorry for the delay. I have a very busy life .
Yes, DU is stable, and even in my job we are using it.
The Validation Step can be disabled for cases where you do not need it, it is optional. I particularly used it only to validate that my Regular Expressions were getting the correct values in the PDF, after the validations made in production, I disabled this when I moved to production.
Do tests with the DU, as it is integrated into the AI package is something out of this world.