In reply to jezb1:
> A British tech trad grade tells you the hardest move, a French sport grade the overall.
> What do you prefer to know?
This was the deciision faced in the late 70s / early 80s when tech grades first started appearing. As far as I recall it was clear that people wanted a way to express how physically hard a pitch was but it took a while for consensus to land on single move rather than cumulative difficulty.
Consensus at the time got it wrong. If we'd chosen cumulative difficulty at the time we simply wouldn't be having this debate now.