This depends how deep down the rabbit hole someone goes. At a basic level, yes, this is true. However, if someone has built a complex system around properties, data views, and various other plugins, they're going to have a hard time.
There is a lot to be said for the value of simplicity, if one of the goals is portability.
I use Obsidian with very few plugins, most of which only affect rendering. The UI is clean, minimalistic, beautiful. I came to it because I was looking for a text editor with a Vim plugin. All in all it's the best text editor I have ever used in my life.
You seem to be saying that the tool doesn’t matter. However, people who use Obsidian typically use it for a reason (other than the file format) over other tools.
There is a lot to be said for the value of simplicity, if one of the goals is portability.