Foolestroupe,
The Anglo/Duet type of straps I think most commonly nowadays are called "handstraps" to separate them from "wrist straps" as used for the English and attached in a different way and working otherwise too.
One 'problem' with the Anglo/Duet straps is that they lock the mid part of the hand which restricts finger movements (a significant problem with Duets but not so important with Anglos since the hand can be more stationary) ,another one that they don't counteract rotation by the instrument which mostly has to be compensated by a cramped activity gripping by the thumb.
The advantage with Anglo/Duet handle compared to the English concept is better transversal stability and better contact on pull.
The so far best solution as I have demonstrated is a combination of a "wrist support" AND a broader than usual compromise between hand strap and wrist strap AND a thumbstrap at an individually choosen location
Goran Rahm