Why does *whole-neighborhood* electrification matter? Because gas pipelines are expensive to maintain/replace and leak methane. Methane, aka "CH4," "natural gas," or "fossil gas," is a nasty, fast-acting greenhouse gas, ~83x worse per unit mass than CO2 over 20 years and ~30x over 100.

As long as one user stays hooked up to a gas pipeline, that pipeline incurs operation & maintenance costs and risks leaking methane. Costs and leaks are only guaranteed to end when every user on a pipeline section - meaning the whole neighborhood - gets of gas.