Other Markdown processors allow using footnotes with labels, and those labels would be replaced with the corresponding number:
This is some example[^cn], but this is another one[^another_one]
- [^cn]: Citation needed
- [^another_one]: https://example.com
This would be rendered as footnote 1 and footnote 2. While I understand that some people will prefer to have some control over the labels, I think it would be useful if there was some tool to auto-increment the number in the case you use numbers. Perhaps even recalculating them if you rearrange your footnotes.