That’s be a use Germany economy is far more distributed (5 or so economic centres) across the country where as counties like France and U.K. have one centre, and places like Spain and Italy two (Madrid/Barca and Rome/Milan)
Certainly not. Nobody wants to book his train 2 weeks in advance to reserve a seat, because otherwise it's "sold out".
Also Commuter Rail (TER) is a total Joke outside of Ile-de-France. Sometimes also even with mandatory reservation.
I think SNCF confuses itself with an Airline
However, I remember the anecdote of how France has two different companies for the trains and trainstations. The first ordered trains which were a little bit to wide for the trainstations, due to a miss communication.
When I read about this, I thought „this could have been Germany too.“