This is because people that bring that argument act like every house is it's own electric island. But that's far from the truth. In developed countries the electric grid is HIGHLY interconnected. Look at this beautiful map: https://www.entsoe.eu/data/map/
So, how likely is it that it's cloudy in Bulgaria and Spain and Germany and UK and Hungary and and and ...
(It's only the US that decided to mis-design their grid. Instead of one united, where each one can help the others, they have 4 different grid. That is also one of the reason why the SAIDI --- duration of power interruptions per customer and year --- is so terribly bad).
Also, if you buy your solar cells to work with ambient light, put them into east-west (instead of south) and use an inverter that doesn't use 50W just for itself --- then you can also get power WHEN it it cloudy. Enough to sustain e.g. your router, fridge etc. Not enough to charge an EV.
But... for a day-night-cycle we have local batteries. They got cheap in the last 5 years. I mean, the cheaper ones arrive at 100 €/ kWh.
And finally: no one every proposed that "a single solution is all we need". We don't need just Ford passenger cars. We also need vans. And trucks. And buses.
By limiting your thinking artificially to "How can I oppose a situation where ONLY solar panels provide power" you're doing your own reasoning power no favor. The starting premises is already faulty, almost like a strawman attack (invent some bogus scenario, attack that scenario, hope that others that can't think sharp fail for this bad reasoning).
The fun thing is that people like you post this again and again, in every discussion. Since years. As if you're unable to learn that the world isn't only "one solar island next to another solar island". Why is it so hard to understand that a grid is inherently connected? And that we have a multitude of ways to generate electric power?