Comparing LA with Paris and saying is easier in Paris is quite a statement!
LA have large roads, grid configuration and a relative recent age: 250 years. And lot of people around.
Paris have 2000+ years of history with layers of people coming around too, no grid configuration but roads created for pedestrian and horses, with some of them existing since thousand of years. And we have a big river in the middle (la Seine), unstable basement with many caves making the creation of any subway a living hell. And on top a lot of historical buildings are protected making demolition for new road impossible.
But despite that, we have good transportation alternatives on top of classic and totally full car roads: trains, subway, bus, cycle. Not perfect, lot of improvements still needed but things change, step by step… And people has been relocated multiple time to allow that. But it easier when the costs are payed by our global taxes and some LONG term plan. we have also the concept of public interest project to relocate people and businesses if they are in a place useful for a future transportation plan.
In LA, i don’t see the change really empowered at the political level, at town level. With large road like yours with no hard turn, you could put so many alternatives transportation:
rail track for tram or automatic train
dedicated bus line
bike protected line with tree separation in the middle and free ticket to encourage the use of public transportation.
Does LA mayor / administrators promote this kind of alternatives? Because it’s what all big towns in France are pushing since decade’s already.