OP mentions "six minutes" as a DB metric. But the thing is that DB doesn't care about trains being late. It's absolutely normal to have an hour delay in Germany. You can be considered lucky if it's under an hour. What will usually happen is that you spend half a day in some village waiting for your connection and travel the rest of the way standing in the doorway with your bags.

I've been on UK trains that were an hour late, others that changed platform at least three times, headed to the wrong destination etc.

Many are cancelled without a decent reason being given. I rarely take British trains now they are so expensive and unreliable. Only long distance maybe because buses are unpleasant.