How much research does typing in "turtle quarry" into google? Heck, even the default excavate program works very well as a quarry now that it can drop stuff in a chest.
Yes, it does. And the moment you set up a turtle to do that, and walk off without having it chunkloaded, well, there you go. Or you set it up incorrectly, and get hosed by it.
That aside, even with the most user-friendly design, you're going to run into issues. Thankfully, ComputerCraft isn't a horrible mod that has to code in fake issues for you to run into.
I stopped developing my lumberjack program when i found out how overpowered it was when used together with redwoods.
Sounds about as overpowered as pretty much any of the standard tree farms, except that this one you can get slightly earlier (maybe ten to thirty minutes, at the most).
I'm not really sure what the issue is, but at least you are adult enough to decide to not use it if you don't like it (similar to me and ind. centrifuging lava). Too often, people that don't like something decide to go on a holy war against that, and often need to be taken out back.
I mean, I'm not saying CC should be removed (I like my touchscreen that lets you order Mead too much) at all but unfortunately most people just use it as a cheap quarry.
It's going to be a good deal slower than a quarry (unless properly coded, and even then it'll only be just-about as fast as a quarry), use more power than a quarry, and be less easy to move compared to a quarry (item tesseract, energy tesseract, quarry; chest for items, output into item tesseract, item tesseract, chest for fuel, turtle).
And, of course, if you want a cheap quarry, the IC2 miner is the way to go. It's actually a great deal better than the quarry, especially if you run a few together, as it skips the vast majority of extra blocks and only brings up the stuff that matters.
I assume people don't like/use the IC2 miner because it's harder to power (no energy tesseract), but a battery moving turtle solution (oh no, more turtles, run!) will easily solve that.
Shh, skynet will hear you!
TurtleNet can read your thoughts, so no about of shushing will save you now. Hehehhe.