My gut tells me its more cargo-cult than anything concrete: MBS just wants to show everyone that the worlds most valuable corporation is Aramco; and wants to curry favor with the elite bankers (and everything that comes with those kinds of relationships) who would make a killing from the IPO.
There are other non-financial advantages of having at least partial public ownership of a publicly owned company like Aramco, like increased transparency and accountability.
In other words, gas prices don't have to rise, electric vehicle prices need to continue to fall. Which they will.
Incidentally, there is a charger near the gym I go to and I noticed that it does not display the price in advance. If regulators do not force electric car chargers to show prices like gas stations do, it tells me nobody is serious.
As for charger pricing, most chargers I see out in public are free. They don't display the price of gas in Venezuela at gas stations because it is too small to account for.