It was easy to feel frustrated by the FIA's announcement that Formula E will remain single-make, in terms of chassis and battery, beyond season five.
This championship is supposed to be a testbed for electric-vehicle technology, and all that seems to have happened of late is the downscaling of season-by-season power and energy targets and the postponement of more open competition.
In the Mexico City paddock last week there was a very consistent, unified rhetoric from leading figures: the long-term viability of the championship has to be safeguarded and the crucial target of a switch to single-car races for season five remains on track.