I have like a dozen different german friends, and it's nothing like you say: everyone in the country curses the bureaucracy, every sunday is like "oh let's quickly get something from the shops oh no wait it's sunday uuuugh"
The taxes seem largely fine relative to the cost of living there, with people living in poorer regions at an advantage even due to the Freibetrag.
Complaining about the bureaucracy is sure everyone's favourite trauma bonding exercise, but I never hear about the solution to it. It's in the political agenda, but the solution is almost always, let's form a committee to decide the agenda of the report about it that would be 1500 pages long and be done in 72 weeks from the day of conclusion of committee's proposal. I feel the issue is the mentality towards problem solving.
Taxes are fine till Herr Merz isn't busy proposing a rug-pull on half of the things you learnt were supported here. Many of our "expat" friends faced this first hand when they lost their Kindergeld unplanned. There was a sudden hue and cry about dependents' insurance being scrapped, not sure of what's latest on it. And the English speaking, tech and finance working expats are not in poorer regions.
I don't know all Germans and maybe it is my circle, but in general I felt if I didn't mirror their hobbies, opinions, and preferences, I wasn't going to have a chance to be on the same table as them or have a heart to heart conversation with them. It's almost like it's too inefficient use of their social time and I'm pretty sure I ain't alone.
The taxes seem largely fine relative to the cost of living there, with people living in poorer regions at an advantage even due to the Freibetrag.