It is VERY important, people, to remember that the WAT limits are minimum airworthiness design standard gradients and have nothing much to do with real operations, except in respect of determining relevant maximum gross weights.
The TERPS/PANS OPS considerations look at a raft of different concerns ... I would be wary of trying to correlate one with the other .. However, it is essential to keep in mind that one must not just mindlessly blast off at WAT limited weights and then be surprised when the aircraft hits a hill during the overshoot ....