With the smaller crew you can make the rider slightly smaller, saving some cash.

A DM+2 on 2D is massive.

Take a humble laser turret shooting at armour 15:

View attachment 2639
Average damage is 0.59 with a 6% chance of a crit.

With an additional DM+2 to hit we get:

View attachment 2640
Average damage is 1.37 with a 23% chance of a crit.

Damage is more than doubled and crit chance is quadrupled.

As far as I have found High Automation is not worth it for warships, but it might be worth it for riders?