Darn wish I saw this post earlier.
The eco+ execution was terrible, absolutely terrible! however, it CAN be turned off completely. eco+ is really just a rebrand (not a feature itself) of all the smart features with the addition of a few new ones.
If you want to turn eco+ off entirely you need to toggle each individual feature off or the ones you don't want off in the mobile app (under eco+ -> advanced settings). The Thermostat firmware doesn't have the advanced settings as of yet.
The slider only applies to a few features, Demand Response and Time of use, so if you have those two features off the slider is meaning less, in the future the slider may apply, but it wont always be temperature related (UX will happen to explain this).
For example, Smart & away would be time related instead of Temperature (note this isn't implemented).
Feel free to ping me if you have ecobee issues, ideally iOS
Colin
ecobee iOS engineer