Hey FreeThinker. I recently set up a helium-3 mining and refining operation on the mun. I was surprised to discover that specialised and enlarged regolith drills are massively inferior to the general purpose and smaller sized universal drills.
Using a scaled up regolith drill, 7.5 metre size, each drill only gives 0.1044 units/sec per drill. Using four of these, my total was 0.4176 units/second.
As you can see, they are also very power hungry, wanting 16.9Mw per drill.
Now compare that to using 6 universal drills of the standard 5m variety. Each of these drills is producing 1.123 units/second, AND the drill only asks for 100Kw of power.
Doesn't seem to make much sense that a specialised drill is performing so poorly against a smaller, more flexible, less energy demanding universal drill.