This has been discussed elsewhere but deserves its own thread.
Any advantage or liability attributed to total vehicle mass appears to diverge when comparing ICE and BEV.
A look at the following will tell the tale:
'Comparison between Battery Electric Vehicles and Internal Combustion Engine vehicles fueled by Electrofuels'
Master's Thesis in Sustainable Energy Systems
Tobias Gustafsson & Anders Johansson
Department of Energy and Environment
Chalmers University of Technology
Gothenburg, Sweden, 2015
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The takeaway for me was that, there is a 'sweet spot' for BEV inertia (vehicle mass ), at which an overall optimum efficiency is achieved, with respect to road load and the amount of energy that may be harvested by regeneration.
https://publications.lib.chalmers.se...621/218621.pdf