I have to use the Tesla app to figure out if there is free superchargers available at 3 supercharger stations near me. ChargePoint chargers at my work just require me scan a card in my phones digital wallet.
The other reply already mentioned that the car knows where the chargers are. But it's even better than that; the car knows how many are available as well, updated in real time. As of a couple software updates ago.
As a legacy car owner (Toyota) currently shopping an EV, I already use an app for refueling, so it seems fine to use an app for an EV. Besides, I'll have 350km range and will charge mostly at home.
The dealerships of Nissan, however, are terrible and don't care about EVs. I've come close to impulsively buying a Tesla from their website a few times, but the ridiculous fee for a paint job gives me a really bad impression that it's junk luxury (and I think that's unfortunately how most ordinary people view EVs).
The Tesla standard is so high that if your customers have to use app, you've already failed.