I'm certain that this issue was raised at launch, and I do recognise it's a moot point with the (likely upcoming) 2025 cars as they don't have this system, but because it's such an integral part of the modern WRC cars that we have in game now, I feel it's worth starting a new topic on this.
The hybrid deployment logic on the WRC (2023-2024) cars doesn't seem to correlate with how such systems work(ed) in reality. While the hybrid charge correctly deploys above the defined throttle threshold, releasing the throttle whilst deploying hybrid power completely empties the charge - and forces the driver to brake again to regenerate power and regain hybrid boost. This current behaviour personally puts me off driving the Rally1 cars as I simply can't predict whether I will have boost or not existing a corner!
This hybrid logic is in stark contrast to actual WRC-HY cars, which retain the charge between throttle uses - here we see Ott Tänak at Sweden, and when he comes off the throttle after briefly applying it with battery charge, the remaining charge is held until he re-deploys out of the next corner. There's also this video from the shakedown of Rally Finland 2022. Note that the recharge quota and deployment amount seem to be separate; a full charge is granted after enough braking, but recharging does not cancel out the accumulated charge, and if boost is left over after a full braking charge, the boost tops up to 100% and can be re-deployed as above.
The current behaviour creates several issues in my view. To get the most out of the hybrid charge, drivers effectively need to decide on the fly whether the charge they may have available is worth using on the upcoming section of road - and if not, they must avoid crossing the deployment throttle threshold until a good enough piece of road emerges. Even at 70% throttle, however, one needs to maintain a very high engine speed to avoid bogging down while doing this, as the car's turbo boost does not come on until this point in the power band - if using the 30% threshold, this is almost impossible to achieve as there is simply no power available. Furthermore, this penalises the driver for trying to "feel" the grip through a corner; apply too much throttle too soon and you'll waste a charge if you have to lift off beyond the threshold.
Hopefully with the hybrid Rally1 cars no longer in competition, EA might be able to source enough data to re-model the hybrid system to work as it did in reality.
