[Jaruzel]

> but part of Roam's power is creating those pages by just making the link

This is exactly how MediaWiki (and clones) have been doing it for years.

[jackbaty]

Not exactly. Correct me if I'm wrong, but in MediaWiki (and others), you need to click the link, (optionally) type some text, and hit "Save" or the page doesn't actually exist yet.

With Roam, the page is automatically just there when it's mentioned. A subtle difference but I'm finding it quite useful.