It can be a very effective technique, though I'm certainly no expert.
I do find two problems. I guess it's just practice:
a) it's slightly slower moving from the pickup (when plucking the E string) to get your thumb up and over and not just anchoring on the A string.
b) I find that anchoring allows me to leverage the plucking fingers, a bit like the way the thumb is built to grab things. That's not to say I'm grabbing or digging in when I pluck, but that as an anchor it allows me to havesomething to "pull against". When floating, that isn't the case. It feels slightly less stable.
I do find two problems. I guess it's just practice:
a) it's slightly slower moving from the pickup (when plucking the E string) to get your thumb up and over and not just anchoring on the A string.
b) I find that anchoring allows me to leverage the plucking fingers, a bit like the way the thumb is built to grab things. That's not to say I'm grabbing or digging in when I pluck, but that as an anchor it allows me to havesomething to "pull against". When floating, that isn't the case. It feels slightly less stable.
Now my right hand doesn't get tired anymore