Look, like I said, if its working for you (be you a bedroom bassist or a legend), and your happy with it, and its not doing you any damage then its all good.
But the least stress you can put your RH hand under is totally relaxed, and that is best achieved (IMHO & IME) with floating thumb resting on all the strings not being played, and moving up and down the strings as required. Everything else I've tried adds stress to the wrist, however little. I'm not religious about it, I still find myself anchoring more often than I'd like, but its something I'm aware of more than ever since having a really nasty RSI flare up a coupl eof years ago.
If you like how your techique works for you, then stick with it, but if you ever get pain, or are struggling with muting strings on an ERB then the worst you can do is give floating thumb a try....