It's more that at a certain point of low usage, it's simply not worth the fixed cost of putting in all the pipes.
From the article:
Minns said the move away from gas connections in new homes in NSW was “largely led by economics” – insisting there were “significant savings” to be had in fully electric homes.
Even if the fixed cost was cheaper, it would be idiocy to continue installing it. Gas is going away, and it's only going to get less competitive as electrification takes hold.
It's similar to installing new copper during the Coalition's NBN debacle, instead of just installing new fibre.
Not entirely true. You can run a home bio digester in a sealed unit pretty cheaply. Feeding it compost and producing biogas (a mostly methane mix) at home that can be piped to appliances. Probably more upkeep than most people are up for. But if managed well, it can be a very ecological option. There are also ways this can be done at large scale with municipal organic waste.
It’s not just the emissions that comes from the stove directly. You need kilometers of gas pipes to service homes which can all form leaks or get punctured by eg road works.