The lengths I will go through to avoid air travel is much higher than a 1:1 ratio in comparable time. When I have to get the cattle treatment I prefer cattle cars over cattle cans.
And even with 1:1 remember that layovers are a completely different beast. If Münich was a hub between Northern an southern Europe I would be happy to spend a well rested day before continuing on. Especially in spargel season!
...but only a fool does not fear German railroads. They could really learn from the Austrians.
The reason night trains are not a thing is because there is no real network. Looking for tickets in Europe it is often once or twice a week departures on specific routes. No real good north south interconnected corridor from Scandinavia.
And as a proper geek I have even sought them out but often found them sold out.
They cost optimized themselves to obliteration.