I wouldn’t be surprised if some tiny portion of the population could legitimately claim an accessibility reason for scrollbars, however tenuous. But certainly not 10% or even 10% of 10%. Further, “accessibility requirements” refers to explicit, medically diagnosed issues not speculation about a preferences vs needs continuum. Moreover, as previously mentioned, accessibility requirements are out of scope—the assumption is that we’re talking about (at most) 10% of users who have a simple preference or custom for scrollbars. If we’re talking about accessibility the calculus is different, but that’s a distinct topic for another thread.