This Steve would say that fuel pressure won't change mixture till all the systems capability to compensate was used up. Fast movement wouldn't be compensated for but a systematic loss or gain in pressure will be corrected for.
The pressure regulator is also known for leaking through its diaphram into the vent line which winds up in the intake of the rear of the motor.
The adaptation values are a big help here. A bad sensor is one making its own answers, this is pretty easy to monitor.
Bosch Master, ASE Master, L1
33 years MB technician