UG is a massive scam in that sense, definitely not what’s advertised.
I can't tell you why it is like that in Germany, but I'm curious why it isn't like that in the US and the UK.
They made Ltd companies simple and cheap so that there is no need to complicate things like in Germany and most European countries.
Since the vast majority of companies are Ltd companies there isn't any connotation attached to them. You can just look the company up to check how old it is and to convince yourself of its 'trustworthiness'.
If you’re selling a product, the LLC should protect you from liability caused by the product. (With many caveats)
But the LLC won’t protect you from your personal actions
If I were an entrepreneur and my startup would incur 100 million dollars of liabilities, my assets won't cut it so the more appropriate to say " you are personally liable for damages to the extent of your assets. "