As mentioned Buses & Subways have issues with "scheduling" so there isn't always going to be one just waiting for you.
Good luck getting to a meet across town when your fixer only gives you an hour notice. Or moving any sort of "gear" around with you on the bus.
Not to mention the check in stations, security/police patrols, or crowds of people your trying to "blend" into that wonder why you are in Black/Camo fatigues are are trying really hard to hide your SMG & the Decker's Cyberdeck under your trenchcoat.
Not that the Scoot lets you hall around an Assault Cannon either, but at if I do have to have an oddly shaped bag over an M23 they don't get long to see it as I fly by compared to having someone across from you for a 30 minute drive.
As for the Dodge Scoot, we are hardly talking about a 1982 Moped here. I see "Scooters" these days on the freeway most mornings that are flying down it at 55-75 MPH.
The Dodge Scoot has the same speed as the Growler, Jackrabbit, Americar, Bulldog, & Roadmaster.
Is it going to fly down the freeway at 100+? No, but that is just asking for attention anyway.
I don't think every team HAS to have a Rigger. Though they are useful for sure.
As I've stated before. I think everyone has to have some form of vehicle. Even if it is the Scoot. And at least 1 team member needs a "Rigger-ish" type vehicle. Something to move as a group once you've met up. Doesn't matter who, though clearly the tech intensive classes can fit one in easier.