Astounded, astounded I say, sufficient single-lip style grinders exist to warrant square R-8's. Sanity preservation, no, didn't bother opening the link.
The OP, C-Bag question is legitimate, with a logical implementation. The early responses fit within that.
Meanwhile, just because they are square, for whatever reason, don't use them driving square shanked tools like taps, reamers etc. Look them up, the square denotes 'Hand Tap' or 'Hand Reamer'.
Unless you have 7th magical sense to interpret tool loading, and I'd question hardness of same collets under torque; against HSS.