That's a bit of a negative look. It's true that some city pairs are really poorly linked (e.g. Marseille / Bordeaux, it's just a regular slow train), however fo

That's a bit of a negative look. It's true that some city pairs are really poorly linked (e.g. Marseille / Bordeaux, it's just a regular slow train), however for many others the Paris-centric network is perfectly fine. Lille / Rennes / Bordeaux / Lyon / / Reims / Marseille going by Paris is not that much of an issue (direct high speed links between those wouldn't be financially worth it). The direct trains, which bypass the city of Paris itself and go on the Interconnection ring road, with its suburban (Massy, Marne la Vallée and CDG Airport) train stations, aren't frequent enough and that needs to be improved. The direct links between some cities also need improving, but there simply wouldn't be enough traffic for direct high speed rail for most city pairs.