The point of mentioning the driving modes is the reverse of "baby the pedal", let software do that for you. EVs are software-defined cars. They have modes that say "don't worry about efficiency, just waste as much energy as I want" and modes that say "balance efficiency with raw performance". In both you can pedal about the same and the car determines how to balance raw torque versus battery efficiency and regen breaking versus friction braking for you.

Many EVs are just as fun to drive in "balanced" modes as they are in "sport" modes, but your efficiency goes way up. Rental cars seem to think you want "sport" modes that are more inefficient because you want to rev that 0-60 more than you want better trip range. That's maybe a good way to sell the EV as fun to drive, but it's not a great way to sell the EV as useful for long trips.

The trick is the EVs already offer both experiences in their software (because they can, because that's how they work), you just unfortunately need to learn the manufacturer-specific ways to change driving modes to get the most of what you want out of a rental car rather than what the last customer wanted or what the rental company thinks you want without asking you. (If you want both experiences knowing how and when to change modes is even more critical.)