Perhaps people need some previous experience of engaging with photography, before they come to LF. So, from iPhone to some kind of digital camera. Then curiosity brings a first experience of film and the new skills needed. That first film experience would usually be with 35mm film. After that, I think most of us will have experienced climbing the ladder of negative size. There might be a bottleneck when the need for a tripod manifests itself. And speaking of process, that has its own path - from the local chemist to the fascinating intricacies discussed on this forum. All this takes time and a degree of financial flexibility too.
All this suggests a certain amount of life lived before the bug strikes.