> point people to the editor on openstreetmap.org, not any of the mobile or "simplified" editing

I wouldn't have made most of my contributions (or even started mapping) if I had to use their website on a tiny screen or had to take pictures or notes to add it later when I had my computer. I use their website, but that only for more advanced stuff.

The right approach is approach is probably somewhere between the two extremes. Teach new users about the website, but also about apps that let you quickly fix/update/add new stuff right on your phone.

You don't have to do this yourself, just understand that simple apps are a good way to bring new users in, that they're good enough for a lot of tasks, and that this newer generation of tech users usually prefer apps to web editors.