The issues I see with using hands for skulling (as opposed to anything else such as camera work, using them for leverage on the bottom in a current etc) is that
a) you disturb your trim and buoyancy
b) are more likely to try to mask poor finning techniques
c) if your hands are occupied with a task (such as deploying a DSMB, using a compass, checking SPG etc) but you have become reliant on your hands for manoeuvring , you may have issues maintaining your position in the water.
a) you disturb your trim and buoyancy
b) are more likely to try to mask poor finning techniques
c) if your hands are occupied with a task (such as deploying a DSMB, using a compass, checking SPG etc) but you have become reliant on your hands for manoeuvring , you may have issues maintaining your position in the water.