Have you tried it? I used the gofundme version like this and it worked well. You make a good point, though, about superior ddrt function of the other devices. They will eat slack as you climb, which is a perk. The akimbo suggestion was made for the sake of versatility if someone is going to invest that much money in a mechanical, and it’s a great device to handle both. Simple, compact, easy to adjust, and good for both. Not as ritzy in ddrt, but just as functional as a hitch (method of operation) without burning the cord on long crane descents. If the goal was to be used in ddrt pruning or climbing removals, the others have advantages, but if the only ddrt it’s going to see is in crane work, those advantages aren’t necessary, while the ability to be used in srt, so the device that is priced similarly to the others is finding consistent application, may be more advantageous to the purchaser.