I've never seen an engineer main with okay game sense or DM after almost 8 years of TF2.
Probably a combination of how braindead most engi mains are + how little impact the class has even if they're good.
Many of the best engi players throughout TF2's lifespan have been HL players who play other classes.
They get put on the class because there are more HL teams than there are okay engineer mains to fill the slots.