I know it is the "in" thing to do to obsess over weight.
If you stop and THINK for a second though, do you see people post about wild range fluctuations based on number of occupants?
I would also like to see folks differentiate "range" as long distance high speed and "efficiency" for day to day use this would simplify discussion.
Weight difference if drastic like number of occupants can be seen as an efficiency change during stop and go, especially if the flow causes friction brake use. Steady state highway use where there are few acceleration events to waste energy, weight matters a lot less.
Engineering improvement almost always involves diminishing returns. Tesla's current products even the Y since it is based on the 3 are mature enough that 2% would be a big improvement. 2% on 300miles is 6miles.
Look at what happened with the S, went from 265miles from 85kw to 402miles from 100kw, that was big but those technologies and lessons learned are already there in the Y and 3, so gains are harder to come by.