Nope not worth it. I am selling a bunch of them on ebay right now. That matter hackers article is a bit over dramatic I think. We use 32nd stepping so they are more quiet than normal but still any tool you put on here will be much loader than the steppers.
2 holes is plenty to mount these with. For the first few months I shipped the kits with enough screws for 1 in each corner block and 2 in each stepper.
I think the bigger issue with them is a slight introduction of slop. #d printers use very small steppers under a very small load. We tend to use larger steppers and bigger loads, these could potentially introduce “wiggle” room.