Statistically, most people rarely if ever go on such trips (in the US anyway)
Certainly some do so often. But vastly more than there are EVs for sale don't. Another huge chunk do but so rarely it'd be much cheaper to buy an EV and rent an ICE car once or twice a year than buy gas for/maintain an ICE vehicle all year.
Until that changes, a national charging infrastructure won't be "vital" to having enough buyers for all EVs ever made.
Sure. And there's certainly going to be folks who objectively don't "need" a national charging network but just have anxiety that makes them "feel" like they do.
But again until the amount of EVs on the market is more than single-digits of the total market, that's not really going to be a barrier to selling EVs to the plenty-more folks who don't' need such a network, and realize it.
back to sample size of 1 though- I actually drive significantly more than average daily... but still well under the range of my EV. I've only taken one trip in many thousands of miles that actually required using a supercharger (or any public charger)- and if that network didn't exist I'd have just rented something for the long weekend for like $100- which is half the amount I save on not buying gas in a single month with the EV.
So while the SC network is nice, I absolutely don't need it, and it not existing wouldn't have changed my purchase.