I think you're right -- depending on the country.

It seems australia has very low friction

and US with our power companies, significantly more

- where you going to find an electrician?

- do you need someone to design your grid-tie plan?

- when will the power company approve your connection?

I've had friends wire their house, have to really work to plan the setup, and be stuck with a working system offline while PG&E approves slowly

Another point: People might be better served NOT buying a battery, instead getting an EV and wiring it into their house.

for example: https://www.tesla.com/powershare/

or just "bidirectional charging" for other brands