"There are community responses indicating that it is NOT working, and there are responses that say, "follow the instructions and it will work.” "

Maybe you're misunderstanding what those posts are asking about.

Do Business returns that issue K-1s  now include the QBI information on the K-1s? YES 

Is the 1040 ready to accommodate those K-1s and compute the QBI?  NO

Sch C, E and F all work, just none of the K-1 computations, yet.