Ideally it would support any plain text file format (perhaps a per-vault configurable list of formats), and maybe show a little tag indicating the format if not Markdown, like it does on PDFs and PNGs.
My particular use case: I’m a BI developer/data engineer, so I work with a lot of .sql files. I use other tools besides Obsidian (SSMS, Azure Data Studio) for writing and running those queries, of course, but sometimes I just want to treat the .sql files as project documentation and/or archive them along with the project docs, and being able to see them in Obsidian would be really helpful.
I imagine a lot of developers, analysts, system admins, etc. would have similar use cases.