Texas is a highly urbanized state and a significant number of families don't have the ability to install home solar, so it cannot be viewed as 'minimum requirement' and some other solution is neccesary.
Maybe people could club together and form some form of group which provides that minimum requirement for the whole area. You could perhaps have an equal say in the group, and have a meeting every few years where you elect some people to run the thing on your behalf.
Or the state government could implement a regulatory regime that ensures its citizens have reliable electricity. A feat the other 49 states seem to have mostly accomplished.
In my country the price of roof mount solar is now under €2000 for 10kWp. That includes government subsidies, however they are not that high (€350 per kWp).
Texas is a much richer economy than where I live, so I see no reason why it couldn't be a requirement, at least for single family homes.
I have multiple friends who have had significant damage to their home solar setups this year alone due to hail and high winds in North Texas.
Some who didn't have hail damage are now having difficulty getting other roof damage repaired because in order for their warranty to be valid they need certain people to remove the panels before other roof work can be done. But those people are massively backed up by all the other people needing panels removed/reinstalled/replaced.
A lot of panels are pretty solid these days. For the friends I had in mind its regular roof damage. High winds tearing up the shingles leading to water ingress inside their homes.
Between this and the ice storm s couple years ago Texas has shown itself incapable of utility grade service.
In general I think the disaster resilience afforded by home solar is simply not valued enough by subsidies and incentives policies.