Have you been in this meeting?
The big boss pressures the PM to pressure you to say that you can code anything.
After all you are the expert right?
They believe that developers can do anything, even the most ridiculous tasks. Of course, developers always do; they can do anything.
They will ask you to build a rocket ship with pebble stones. They will give suggestions on how to do it, and they often end up confusing you and embarrassing themselves as well.
Developers need to be left alone with the how's. You can, build a rocket ship, yes — maybe not with a pebble, but you'll get your rocket ship in the end.
Just listen to your developers when they point out the impossible like the "green" red lines…