Diabolus turret shooting over walls - bug or feature?

[Coolthulhu]

Turreted mechs with giant body size, such as diabolus and war queen, tend to use the turret to shoot over walls. It sounds bug-like, but I don't see a bug report for it, despite it being a common occurrence in mech playthroughs.
It might be considered "realistic" in that wall height is not unlimited and the turret might just "see" it as a taller sandbag. Though if we go this route, roofs should probably block it, and shooting back should probably be allowed.

So: bug or feature?

[Breadbox2k19]

Best to lower their bodysize so they could no longer shoot over walls.