The only problem with straight arms is that with standard cable heights it pushes your upper body back such that gravity now has an effect and your fingers and shoulders can get tired.
I understand what you are saying. But if you flex your arms you will be done fast. You already have to pull yourself up so many times. If you primarily climb this Via Ferrata with arms flexed you will get them pumped and burned lightning fast. But, as you say, with arms extended you shift all pressure on the wrist and fingers. They will slip eventually and that is the moment when you will fall. Hence, the felacy of the resting system. Most will use that as an aid while advancing. The good part? It is mostly diagonals at low angle and horizontal overhangs. If you lose it you will jot fall vertically but slide on the safety steel cable. On the vertical sections under no circumstances one should commit this felacy. There is where the big danger of falling lays because of arms fully extended.
The only problem with straight arms is that with standard cable heights it pushes your upper body back such that gravity now has an effect and your fingers and shoulders can get tired.
I understand what you are saying. But if you flex your arms you will be done fast. You already have to pull yourself up so many times. If you primarily climb this Via Ferrata with arms flexed you will get them pumped and burned lightning fast. But, as you say, with arms extended you shift all pressure on the wrist and fingers. They will slip eventually and that is the moment when you will fall. Hence, the felacy of the resting system. Most will use that as an aid while advancing. The good part? It is mostly diagonals at low angle and horizontal overhangs. If you lose it you will jot fall vertically but slide on the safety steel cable. On the vertical sections under no circumstances one should commit this felacy. There is where the big danger of falling lays because of arms fully extended.