Looking at the comment that raises the objection [0], they advocate for using plain text files and they use a directory of markdown files. If that is the desire, they can use a directory of org files (plaintext like markdown, just different syntax for / italics / and =verbatim= and such.
Hopefully they're not using any external program to search through those markdown and org files though, else they get forced into an interface to interact with their files.
One of org-mode's advantages is a broad export support, into everything from even-more-simplified plain text to rich HTML, to everything supported by pandoc.
[0]: https://forum.zettelkasten.de/discussion/comment/2275/#Comme...