> because they're such hell for skateboarding, so it never occurred to me they'd be an ADA thing as I assume they're equally hard to navigate in a wheelchair

Why do you think so? Even the front wheels of wheelchairs are much larger than those of skateboards, and their main wheels typically are pneumatic (front ones, too, probably, but cheaper ones might skimp on that)

>I mostly notice because they're such hell for skateboarding, so it never occurred to me they'd be an ADA thing

"Be hell for skateboarding" wasn't likely considered a bonus by the disability people because it would rally "those sort of people" to their (otherwise legitimate) cause.