Interestingly Ferrari missed the opportunity to pass Mercedes at a restart after a safety car late in the race [1] because software cut off one electrical motor close to the end of the main straight [2]. That was a common choice to preserve energy for other parts of the track. Still Mercedes has a button on the steering wheel to override the software and keep delivering power from all engines. That might have won the race for them.

[1] https://youtu.be/rhmGaCjpoBY?t=4m20s (check the speeds and the nice 3-way pass behind the leaders)

[2] http://www.motorsportmagazine.com/reports/f1/2017-belgian-gr... at section "5) The crucial power de-rate"