No feet, no boots

Hat. :P

As neat as that sounds, I'm pretty sure Cassiopeia's passive is more so in place to give her the advantage of being able to buy 6 full items without worrying about boots. It helps her identity of being a high damage late game AP carry.

Nami doesn't really need the extra slot in my opinion. She isn't really in the same boat as Cass. she is a support after all, and has less gold to play around with in the first place most of the time. Plus I feel waiting for your move-speed to scale up would feel terrible on her. I'm a Nami main and I'm perfectly happy with buying my boots, just gotta wear em as a neat hat. :>

Cass starts with the most ms with sorcery and precision

i think nami should get a second passive where she gets boosted speed in the river. seems fitting.

Should Urgot buy six boots then? One for each leg? Cass being bootless is part of how they balanced her kit, and then they made flavor to surround that decision: Nami wasn't built with that in mind, and moving forward on a change without fully appreciating the ramifications would be bad sauce.

Cassiopeia was designed around that basically.

1. Kiting is a really strong part of her gameplay
2. She is the AP version of a hyper carry, the passive helps with that, since she can buy another damage item without having to give up movement speed like other champions

But this is not true for Nami. She is kiting way less than Cassiopeia and she isn't a hyper carry, but a lane bully. It doesn't make sense gameplaywise for her to have that effect, it would just be for thematical flair. And if you begin to add this passive just because of that, then you have to do the same for: