I have for a bit, decided to stick to MD because of its accessibility to my non-tech collaborators, it is easier for them to install Obsidian, and MD is very well-known.
Aside from that, I am planning to use Pandoc to process my sources into other deliverables: web pages, PDFs etc. I am myself still learning this ecosystem, and markdown (in my experience) just enjoys more visibility.
Truth be told, I did not have any exposure to Org Mode prior to looking it up for knowledge management, so all of the above might be my “little duck” brain speaking.
What’s so bad about the Rust compiler? I know it’s slow, but given all the analysis it’s doing, it makes sense. And, from my own experience, setting correct optimization levels for dependencies along with a good linker makes incremental builds plenty fast.