> I'm sorry but until you've experienced a startup shutting down the product that you built your whole knowledge repo around, you won't really understand the need for portability.

It is not hard to understand why portability is important and I do not need to lose anything to empathize with people that have. I think it is important but it doesn't matter how important it is if the tool you're using to secure portability is insufficient for the task you're trying to accomplish. That is backwards thinking.

> I could care less about the shiny features, because I know that in 10 years this product will be defunct, while markdown will still exist.

I'm not speaking in favor for this person's startup, I'm speaking in favor for better tools for note taking, thinking, brainstorming, and managing knowledge. Plain text is not good enough, in my opinion. This is coming from someone who uses plain text for all those things because there isn't an existing adequate alternative. If plain text is genuinely suitable for your needs, that's great. I just really doubt that anyone that uses plain text can genuinely say that they aren't held back by the limitations of the format at least in some way.