I've had Econ enabled since I got the vehicle. The acceleration is excellent with it enabled so I don't see that as a constraint. The main effect is to widen the allowable difference between the target and actual cabin temperatures which reduces the need for the engine to be running in order to (i) supply the electrically-powered aircon when the battery is below 30% charge and (ii) run the engine to supply cabin heating.
Now that the weather is turning colder the latter effect is particularly noticeable if in queuing traffic when the engine normally goes to sleep once the battery is above 60% charge. However, the antidote for this is to turn off the heater fan and turn on the electric seat heating. As I've said before, Honda missed a trick in not designing the aircon to run in reverse as a heatpump. A lower speeds (ie lower engine load and running on battery for a lot of the time) the engine struggles to warm enough to provide decent heating. I thought Japan got cold enough in winter for the designers to consider this aspect.