Visit Brussels, Frankfurt, Paris, Cologne, Rome...

So where exactly is Frankfurt "full" with encampments?

Banhovsviertel but not only. You really want to say the city doesn't have a massive homelessness issue?

Your claim wasn't that there are homelessness issues (which there are and they got worse over the last decade at least) - you alleged cities full of tents and other encampments. And the Bahnhofsviertel always had some presence - sometimes more, sometimes less.

Homelessness is out of control in the US and elsewhere too.

The real question is whether there was a statistically significant difference compared to previous years ceteris paribus (same location, same time of year, etc.).

Also the influx of various refugees over the years should be taken into account.

Anecdotal evidence that there is homelessness does not automatically mean doom and gloom for a country.

Mostly fresh migrants who believed that Europe has a certain living standard for everyone and spent ungodly money to get trafficked from Turkey or Libya.