It can even be jumper pins the user who cares can attach their own switch to. I'd pay extra for a slide switch on a USB stick. Heck, USB sticks often come with a slider for a retractable cover, obviously that cost is insignificant.
Hard drives used to come with those jumper pins. They are not costly.
The point I was making is that the signal integrity work would be a lot harder than for a hard drive of yesteryear. The BOM cost of the switch isn't that important
Hard drives used to come with those jumper pins. They are not costly.