Like all buildings should have some kind of standard for solar panel placement added or retrofitted with a very low cost modular mounted frame. Then, when you get an appliance it has a built in battery and comes paired with the right size panels that are sized for each region in the local store/wholesale distribution layer.
The whole scheme is hybrid in the first phase of a decade or so while edge cases and issues come up, like how to handle high rise buildings. Then the burden of grid infrastructure is less of a burden on the poor in total because few people are going to replace all appliances in this instance unlike those that can install a whole house solar system. The entire thing would be more incremental and serviceable over time with modularity. It is less efficient overall compared to a single controller and battery but doesn’t require large upfront cost or repurchase later down the line.
That seems extremely inefficient. You already have a panel in your house with some capacity to push power to your appliances. It makes a lot more sense for most applications to just set up enough panels to feed that power and put them through an inverter.
I don’t see a scenario where you build a bunch of blank scaffolding in your roof (assuming you have an accessible roof in the first place) and then have to climb up there every time you buy a new microwave.