Can You Drop Consistency from ACID?

Question

In his book "An Introduction to Database Systems" C.J.Date wrote a chapter about the ACID principles called "Dropping ACID". In this chapter he calls Correctness(Consistency) "essentially meaningless" and the other principles at most "a desideratum".

This book is from 2004 and everywhere i go on the internet i see ACID principles as the guidline for RDBMS application programming. Does that mean that Date's ideas to ACID were not accepted? Or is ACID from a theoretical point of view not as mandatory as it seems when reading internet documentation about database programming?

I hope my question makse sense and is in the right forum.