[coldtea]

>Here, we see engineers reduce the contributions of such common roles as: Product Manger, Program/Project Manager, Scrum Master, Marketer

Cow dung is common too, but not necessarily useful. Maybe for manure...

Most actual work happens despite those roles, not because of them... Or even against them - and is dilluted, sabotaged, rushed, and crapped upon all the time by the decisions of the roles above.

If you meant "software production needs this role", then no. Software production (from Xerox Parc to the Linux kernel) can be just fine without them.

If you meant "a modern corporate bureucracy needs those roles to make a product", then maybe, but that's part of the reason those enterprise products are shitty.