[stewartm]

If you work for a business, are you not all 'business people'?

In my working lifetime, having people occupying managerial roles that have zero relevant shop floor experience, has gone (or at least feels to have gone) from being the exception, to the absolute norm. Therefore in my experience, this, combined with the point you started with, is the nub of the matter.

Managers when faced with not having a clue what a team in a field that naturally has its own jargon are talking about, are desperate to recover the balance of power. Thus they end up speaking a language designed to to exclude all apart from those who submit to their influence and join in.