This is also why I'm looking forward to trying to use the Digital Marketplaces Act to demand API/Docs for the content of my Apple Notes. Its very easy to use on my devices, but the format lock in is unacceptable. I want to be able to just sketch some random written thoughts before incorporating them into Obsidian later, but the new format is pretty obtuse and makes this pretty hard. I actively avoid using it due to the data lock in, which is a shame since it works so well with the pencil on the iPad.
If you have something better in mind in terms of exporting or data storage you can request that. I've emailed the main developer (George, george _at_ zengobi dot com) and he responds personally pretty quickly.
It is understandable to have the opinion that a plain-text-based app has just as much utility, especially as a heavy user of Obsidian and light user of more specialized and deeply developed apps.