Funny they name Ussel-the one time I was there, must have been pre 2000, it was to take an overnite train from there to Paris, Corail stock, as I remember at that time no need to even make a reservation for that. Must have had one or other type of pass.
But now it seems to me that for a big great part rail services are also in line with population density. France out of the Paris mega-area compares then with Scotland or Ireland-also not really very famous for intensive or very fast trains. And let us then just bypass Spain- much, much worse. Same difference between the high and low speed lines. Also as a broad overview, railways use either the ´often and short trains´(tipical UK out of LOndon area) or ´when we run its a long one=France. Both have their proś and cons. Plus that FR has as I have heard about the very highest track-use charges of all of Europe, so it also makes a little sense from that point of view.
In fact some years ago many timetables were made to use ´fixed times in mins´ for not these very minor lines, but not in all cases also every hour-so they were able to copy that model. In the far north it certainly does apply. FR also has a log time tradtiion of mornings ´periods blanc=time set for possible short maintenance, no trains.
These lamentations about the bad service are tipical newsppr slack times parrotting that turns up all the times without much extra info. Unless its a local news-then it follows with the urgent request that place (A, B) also should have a direct TGV to the big capital and ASAP!