Also, you'll need wires that 5 times thicker. Instead of needing a reasonably 1mm^2 for a normal 16A line, you'll need 5mm^2 for the same power.

Even if we were to standardize a low (<50V) voltage for DC distribution within homes, we'd still need ~120/240VAC to power big stuff, or we'd instead need even-larger conductors (more copper) than we use today to do the same work with low voltage.

But, sure -- we can play it out. So let's say we have an in-home 48VDC distribution standard and decide that this is the path forward and we enshrine it in law.

We need to convert whatever the solar system has available to 48VDC. Then, we need to distribute that 48VDC using a completely separate network of cabling. Finally, we still need to convert 48VDC to whatever it is that devices can actually use.

That's not representative of a reduction in steps, or an increase in efficiency.

That is instead just an increase in installed infrastructure expense, and a decrease in device compatibility. It takes what we have, which is simply universal (at least within any given geographical area) and adds complexity.

And for what? What's the perceived benefit?

DC infrastucture makes sense in highly specialised environments.... Like new gigawatt AI farms