"Embedded" is a property of how the box is deployed, not what's inside it. The lines are blurring because the word "embedded" has been overloaded with an interpretation it doesn't merit for too long. If you mean "bare metal", say "bare metal". Mind you, if you're going to argue "no OS at all" is part of the criteria, FreeRTOS and the like are banned, right?
Personally, I'd say that FreeRTOS is just on the line, but others may draw that line differently. However, I do take your point about changing interpretations.
