> And they don't have a free house to be mounted on.

Rooftop solar is more expensive than solar farms. There's nothing free in putting a solar panel on a roof. (Which is a pity because it means that if your country doesn't have a desert, the economically optimal way of installing solar panels is deforestation, but that's the world we live in…).

> Because it turns out, a 60 degree angle that completely avoids shade is just as good

Not at all…

The sun isn't just going up and down you know, it also circles from east to West…

> They're also not trying very hard to avoid shade. […] When the sun is near the horizon, you want your rows of panels to be very far apart or at different heights.

> A commercial solar plant like one pictured in the article will have each panel shade most of the next row's panel when the sun is very low.

I'm sorry but this is utter bullshit. The commercial plants do avoid shade as much as possible because shade destroy efficiency (one cell being shaded criples the output of the entire row…).

They don't care about shade when the sun is low because when the sun is low the incidence angle is terrible in the first place. You want your average panel directed south (or north in the southern hemisphere), when the sun is low, it's going to be completely in the East or completely in the West, and you care about the cosine of your incidence angle, which means the output is going to be near zero even without any shade whatsoever.

> It's mid-april. If it's cloudy this far from the depths of winter, that means needing more panels is much more of a year-round thing.

Of course clouds are a year-round thing, what do you think… But sunny days are still much more frequent in summer.

> Which means a household array needs to be bigger as a baseline

Yes, but that's over-paneling…

> The thing that would make 90% unreasonable is the difference between winter and non-winter power output. If spring and/or fall also require lots of panels, then 90% gets more realistic because expanding the system saves money for more months of the year.

Sigh… Over-paneling 10x isn't going to be more worth it just because in spring and winter you need 5x. That's a nonsensical argument…

I'm sorry but you obviously have no idea about any of these things, I can only invite you to document yourself better at this point, because you're just pilling up crazy takes on top of crazy takes here.