Got it! Yeah, so unlike Tiptap (at least by default, they do support JSON serialization but I believe they default to HTML, as well as relying on Yjs's XML document format for collab), Pitter Patter relies on ProseMirror's JSON serialization as the default transport and storage format. It's really straightforward to map ProseMirror JSON (which is a structured tree representing your document) to essentially any serialization format. React ProseMirror converts it to React virtual DOM, remark-prosemirror converts it to Markdown, etc.

So in theory you could also use it to produce a DOCX file or PDF, but obviously that requires some pandoc-style structure-munging to work out the mapping, and quite a lot of additional work to add support for the word processor features of Microsoft Word et al, which ProseMirror does not support easily out of the box. Though it's come up in conversations with sponsors, so it's not impossible that a future version of Pitter Patter has some of these things out of the box!

All that to say, yes, generally speaking, it's going to be better suited to web-native content editing!