You put my same thoughts into words.

" Those principles actually do work extremely well in many, many industries. PMP focuses almost entirely on Waterfall methodology and gaining the certification is largely driven by terminology and math.

But software is a special snowflake in the project management world and this is why countless books around managing software continue to be written."

Thanks.

I highly recommend you read the book I asked about in a sister comment. I wish the business people would read it. The issue I think is it correlates and requires an understanding of other "techie" and STEM subjects like queues, math (related to queues), network protocols, and traffic flow. Until the business people understand the maths and tech topics that book appeals to, friction will continue to exist.