A general problem that I think exists with suburbian public transportation is that it is often conceptualised as 'getting to the centre'
Absolutely. If I want to travel between my auntie and my sister on the outskirts of London I have to use my car (a 25 minute drive). otherwise I have to go from zone 6 all the way across the underground to the other side of zone 1 and then all the way back out again, which can take 2 hours. There are buses but on the weekends one an hour and it takes at least an hour and a half.
Now if I lived in one part of London and worked in another area on the outskirts, that's a nightmare. Ad astra per aspera
That does not help you for daily commutes, when these highways are jammed, but the rest of the time, it is really convenient to drive around Paris. In the long run, we're all dead. John Maynard Keynes