Bavaria is not Bavaria. In the south, there are regions with over 300 kWh/m² more irradiation.
My former neighbor in the industrial area also fully covered his roof with photovoltaics. He was calculated to have incredible yields. He called everyone who didn’t do it stupid. Unfortunately, the hoped-for financial windfall did not materialize.
We went through the calculations with my brother-in-law. He has designed systems for years and came to the same conclusion. I don’t want to register a business, file a tax return, etc. for a few euros, and the small system doesn’t pay off here. It can look completely different with Climbee, for example.