You don't see streets filled with chargers because almost nobody has an EV yet. Just like you didn't see many gas stations providing unleaded fuel two years before catalytic converters became mandatory.
The govt are going to make these cars mandatory soon. London is the ideal place to do this due to infra + rich people with EVs (more than you might think, far from 'almost nobody'), yet I don't see any street that has charges along it.
My point is that it's not easy. Having to upgrade the grid and dig up tons of roads is simply not easy no matter how much people want it to be.