Why not invest in a vast 24/7 high frequency electric bus network instead of the big infrastructure costs of trains?

Sounds neat but what kind of range limits would that impose on each trip? Switching from one means of transportation to another, even if both are buses, increases the total travel time significantly. Not to mention all the hassle involved for passengers.

trains can be superfast. For example a tgv from strassbourg to marseille is 5-6h. Same with car is for me 8h. Bus is even slower so I would wildy guess 12h. Plan is btw 1 1/2 hour.