I know right? He does use them more than he should. A turtle mining system? Couldn't he just use quarries like everybody else while he waits for RP.
Actually that was probably the one turtle build of his I didn't object to. And honestly it was a good thing, too. The last hitch many people have when it comes to RP2 replacements is "But what about FRAMES!?!?!" Which really means, "I want my frame quarry!" Well, he addressed it, now shush about RP2.
He even used them in his frame quarry system when he could have just as easily used a very nice deployer/block breaker system.
I thought the same thing until I tried to design one. The problem is the lack of faces on the wells. You need one for the deployer, one for the breaker, one for power, one for the frube, one for the drill face and one for power. Add it up, that's 6 faces. Except in a traditional setup you have them sitting side-by-side so two faces are taken up by the wells to either side. So fitting 6 connections on 4 faces is kind of, well, impossible.
At that point you have two options. First, turtles. This reduces the number of faces required down to 3 as the turtle is deployer, breaker and frube in one. That leaves power and drill face.
The alternative is to rig up some way to have the mining wells offset to free up the 2 extra faces, then fit them all together so none of the tubes between deployer and breaker interact with each other or the frubes, still get power to everything, and redstone signals to everything, and wrap it all in a frame. When I realized the mining wells needed to be broken and redeployed every movement, and realized what it would take to do all off that with an offset, I decided to just go with a tunnel bore. Trust me, there's no "easily" or "nice" about a non-turtle mining well frame quarry.