Because chargers were enshitificated before they were widely deployed. I want to arrive on charger, connect the charging hose, wave a debit/credit card or my phone with NFC interface and start charging.
But noooo, you need to have an account with your debit card linked to it and use their half assed application or you won't be able to activate charger. And you should better pray that charger in your destination is actually operational and your car is compatible with the charger, which itself is fucking wild.
The whole EV industry essentially ignored lesson learnt for last 100 years using ICE cars - gas pumps, with somebody who can assist you if you don't know do exist for a reason!
Rivian CEO should go outside and try what is the average charging experience for an average customer.