Personally, if I have to take more than 2 modalities of transit to get where I have to go then I just use a car (taxi).
Maybe the French are a bit different, but in America no one would want that. The idea that you’re beholden to the others schedule (or multiple others!) and it could be late or off or whatever or if you miss it you’re screwed is exactly what Americans fear most about communal transit. The American independent mindset would kill that.