I got into $200k worth of undergrad student loans. I am still paying them back and probably could have done things to reduce that burden early on. Regardless, I don’t regret it for a second because I’ll be done paying for them in about three years, and I’ll keep the high income job and great network I’ve accumulated in the process.
This option should most certainly be made clearer to students. I don't want to play a blame game, but I think its somewhat related to the culture of parents wanting "the best" for their kids and considering all money spent on education as an "investment". Its not. Its a huge financial commitment and should be thought through carefully.
Now, its not like college is completely useless. The connections you form there last for life. Many founders initially met in college and so on. But someone considering taking on ginormous student loan debt probably should consider whether that is worth paying off loans for decades.
Still, I agree with the general idea you're reaching for. The ostensible premium of elite private schools isn't worth going into crippling debt for in most cases I can envisage.
This applies not just to German citizens but to anyone who studies in Germany. The stipend sources may be slightly different where you come from though.