As a school SLP I’ll offer my perspective, take it for what you feel it’s worth. I work with K-12 in the American school system. In any given year, I regularly see ~60 students for speech therapy services, and I always have a handful (let’s say ~5) students who have some form of stutter (whether mild or severe) and are working on fluency goals. Of course some years it’s more, some years it’s less. In the 5 years I’ve been working and staying in my current area, including kids I’ve met that have moved away and whatnot, I’d say I’ve met 20 or so people with an identified stutter. But of course, when I ask my students their experience, most are meeting another person with a stutter for the first time when I put them in a group with another student working on fluency (unless they also have a parent who stutters). They’re all ironically in good company feeling like the only ones in the world navigating life with a stutter. Some people only stutter in certain situations or environments, and you would never know unless you happened to be there with the right conditions. I’ve had a student who only stuttered around one specific parent. Some people have a very mild presentation in their actual speech, but are very sensitive to the issue psychologically and need a more counseling focused approach (education, self-advocacy, etc) vs drilling speech fluency strategies.