"Every house should have solar panels"
long before one gets around to putting them on small residential roofs, every large roof - big box stores, warehouses, schools, etc - and parking lots should be covered with solar panels
Yes and no, but before you do that realise there's a real problem to this when you do it at the scale you are talking about. Classical grid systems were designed to deliver power from a source, not receive it from what is nominally its consumer. Protection systems are designed with this in mind and they don't cope well when power flows from many sources the other way. Countries with high rooftop PV adoption have had to rush in and spend billions on infrastructure upgrades.
This is something you can plan well when small loads trickle in over time. It's not something that you can manage when several MW come online at a single time. I can go install solar panels on my roof and it doesn't have an impact, over time all my neighbours will too and the government can plan for the slow change in demand here. On the flip side my local (okay next city over, we don't have one) IKEA put solar on its roof and then sat their dumbfounded when they were told they weren't allowed to turn it on or export to the grid and instead had to wait for a major substation upgrade to happen 9 months later. (They eventually compromised that their solar system can be connected providing it is remotely rate limited / controlled by the power company until the substation is online)
It's much easier to build out small systems at the consumer than large commercial / industrial systems at large commercial / industrial consumers. Big things take planning.