I am building a walk in shower. the Sheetrock is up, time to start putting up the Kerdi.

In demo video, they band all corners and lay sheets cut to each wall. Is there any reason I can't use single sheets to go around corners? I understand placing each sheet will be a bit more work, but, it would seem to me that fewer seams is better and also saves a little material. I was wondering if maybe it had to do with the thin set setting up very quickly, allowing little time to fuss with the kerdi.

Or maybe Schluter likes selling Kerdi Band!