Hi there,
First of all, awesome work! Obsidian looks and feels great 
I was first attracted to this project because I thought that using markdown documents was a brilliant idea. I already had a lot of notes in markdown so I didnāt have to migrate data to start getting value out of Obsidian. I love knowing that those are my notes and that because they are just markdown files they will be useful beyond the future of Obsidian.
That being said, Iām a bit concerned about the limitations of markdown. I see that Roam releases new ācomponentsā such as range sliders, but in order to extend obsidian with such features it would need to deviate from markdown. I see some extensions such as using marmaid by using ``` blocks, but Iām not sure thatās the best API for adding capabilities to markdown.
Iām writing this post to propose https://mdxjs.com, a superset of markdown that allows to embed JSX. Since itās a superset (imagine what Typescript is to Javascript) it means that anyone that comes to Obsidian with their markdown notes will have a good experience.
This proposal is two-fold: On one hand Obsidian could expose the primitive components (https://mdxjs.com/table-of-components) which would allow for themes to go beyond CSS personalization. On the other hand, by having JSX, users could author components (such as the range slider) to extend markdown capabilities.
Thoughts?