In which way does it screw any of this to create a political obligation to finance charging-stations at the relatively few places where a European main-road doesn't have sufficient demand that the market alone will ensure that chargers are installed?

It'll cost taxpayers a bit of money of course. On the other hand it'll be a benefit for competition between EVs and ICEs that consumers will know they can buy either type of vehicle and feel certain that there'll be sufficient chargers along ALL main-roads in the EU.

And let's get real; a few charging-stations is small fry. It's not as if this decision will amount to more than an utterly TRIVIAL fraction of the transport-budget in EU.