In past discussions about whether or not to anchor your thumb, people have mentioned the "floating thumb technique." I myself have anchored my thumb on my pickup exclusively for the past few years of my playing. However, in the last year or so, I have been trying the "floating thumb" thing. I have found that it does keep the relative angle of my fingers to the strings the same, and this is probably more efficient sound wise, however, the largest drawback I find is that my right arm gets extremely tired. I do not like to rest my arm on the top of the bass because I do not like the right angle it forces my wrist into. Do you other players out there who use this technique rest your arm on top of your bass? If not, doesn't your arm get extremely tired after a while? I personally have found that even though anchoring forces your hand to pivot at different angles for each string, If you are like me and do not rest your arm on the top of your bass, anchoring also gives support to your arm when you hold it out, and this also allows the angle of your wrist to be straighter, which in my opinion give you more strength. I have also found that anchoring your thumb gives more strength to the fingers when you pluck the strings since you are able to sort of pinch the strings with your hand due to the opposing force of your thumb instead of relying on all of the strength in your fingers to pluck the strings. Any thoughts or comments would be appreciated!