Easily: it's techbros again forgetting that an expensive asset only wealthy can afford isn't a solution to a mass scale infrastructure problem. And again, just like with Tesla bros, nothing about household solar is independent and requires infrastructure to support it - which, just like with trains, isn't going to get required investment because you're dreaming about individual investment.

Like you say, I want trains - proper infrastructure supported renewables, not Teslas - home individual infra only affordable by wealthy individuals at the cost of shared infrastructure while lowering resilience because it still uses shared infrastructure.