Please do tell me, how often do you drive 500 km NON STOP?
"NON STOP"? Never.
With 1 or 2 10-minute stops to pee and/or refuel? Frequently (at least, in non-pandemic times).
The unavoidable fact is that recharging an EV takes far longer than filling a gas tank, there are fewer places to recharge (especially with the right type of
fast charger) and charging stations have far slower throughput.
Sure, in the UK there are motorway service stations every 30 miles or so, most of which now have a couple of EV charging bays. C.f. probably a dozen fuel pumps where nobody stops for more than a few minutes. Turn up looking for fuel, and if you're
unlucky you may have to queue for 5 mins. Turn up looking to charge and if both bays have cars parked in them while the owners have gone off for a meal, or if they're out of order, that's tough - they could be there for hours, so it;s another 30 miles to the next station. So, you need to start looking for a charger while you've still got 60 miles or so of juice... and there's 60 miles off your "300 mile" range.
Then, does your destination have charging facilities? Unless it's out in the sticks there
will be a filling station within a few miles (and, if you're truly headed for the wilderness, you can always carry a jerry can) but, with an EV, you can't assume that so that's
another margin you have to leave, or you'll have to
start your return journey with a break...
TL

NR: 300 miles of EV range that takes an hour to fully recharge at a specialist charging point is
not the same as 300 miles worth of fuel that can be replenished in 5 minutes at any filling station.
Now, these aren't necessarily deal-breakers, but they're definitely disincentives to spending a premium on an EV... and while the current provision of charging points may be OK for the current level of EV ownership, it's not clear how the current system will scale if EV usage is to expand, and - without some sort of subsidy - I'm not sure what the business case for investing money on charging stations will be. It's unlikely to be the sort of cash cow that a regular filling station provides. The current "sweet spot" for EVs is for people who have a 50-mile commute starting and ending at their private driveway, who don't need public charging points at all - people
without private driveways will have a problem, but that's not going to be solved by charging stations on long-distance routes.