A quick check of OBI (our main home-improvement chain) shows that I can get that 800w "balcony" plug-and-go system for 300-600 EUR depending on the exact panels and inverter I want, and it's all pre-approved. I have fill in a simple, free form online announcing that I've done so or am planning to, and I'm now technically an energy seller - my local utility pays some for power fed back into the network (not nearly the rate they charge for delivering power, but better than a poke in the eye with a sharp stick). If I don't want to accept 0.08 EUR/kWH, I'm free to plug in a battery for any excess. Our base load when I have my work computer and monitor on during the day is somewhere in the neighborhood of 300w, so I think this would work out well for us. I need to get off my bum and do it.

Shockingly unbureaucratic for Germany.

There is, as one could imagine, somewhat more burden for larger systems that require the involvement of someone who is actually an electrician, but I don't want my neighbors to be able to DIY fire hazards.

Yeah, as long as you are basically giving free power to your provider, it's all good.

God forbid you produce more, or try to sell it for market prices or even sell it directly to other individuals through a microgrid.