I had to take a minute out of my day and share this wonderful and funny video about how is it like to be an engineer in a corporate world.
I really suggest that you take a few minutes to watch it.
Of course, as with everything, it can be up to interpretation. The engineer could also have asked what do they really want to accomplish by asking to draw lines in this fashion and then maybe a better way would have come up for the real goal to be achieved. Others might say the rest of the team should have asked clients (or themselves) this first.
A lot of time clients do not know what they really want and what the best solution is unless it's suggested or recommended to them. As developers we should try to keep this in mind always. Dialog is everything. When in doubt, ask. This should be our contribution to our companies and to the world of software development in general.