IMO most important are
1) offer it in all vehicles, every shape and size
2) offer the fastest charging you can, including DCFC
(before the inevitable comments come up - this one has nothing to do with whether it makes sense or is necessary, but entirely about optics - to the general public, they see "charges in 4 hours"? / "charges in 10 hours"?! That's an eternity. "Can be fully charged in as little as 20 minutes!" would sell them on it instantly. Even though they'd maybe do that only once a year and their standard charge at home would be ~2 hours)
1) offer it in all vehicles, every shape and size
2) offer the fastest charging you can, including DCFC
(before the inevitable comments come up - this one has nothing to do with whether it makes sense or is necessary, but entirely about optics - to the general public, they see "charges in 4 hours"? / "charges in 10 hours"?! That's an eternity. "Can be fully charged in as little as 20 minutes!" would sell them on it instantly. Even though they'd maybe do that only once a year and their standard charge at home would be ~2 hours)