Not necessarily. I suspect that people that have overlap in hist job positions but still need to use a "shared vocabulary" will diverge in their understanding of each word, not by laziness but because simply is another job.

For example, if a DBA and a JS Developer say "We need to use a scalable database", they probably don't have the same thing in mind about what "scalable" or "database" exactly is, however, both are concerned about provide data at performance.

So, if a naive web developer wanna "a scalable document stored!" you can just give to it postgres and presto! ::troll:: ;)

I'm wondering why you have managers in scare quotes. Are you suggestion that they aren't really managers or that managers as a position is just some sort of fraud?

Also Project Manager and Scrum Master are just positions that describe roles and responsibilities an organization / on a team. The people filling those roles needn't be clueless.

I feel people in those positions are just people who want a job in tech / startup and have gotten there not because they deserve those positions but because, they've given up on learning the skills and resorted to becoming a "manager". At least from my experience this is what I've seen. They generally don't really add any value because they don't have any skills, don't know how to do anything.

The positions I mentioned above are usually the position people who failed at picking up any valuable skill seem to resort to.