Is this still needed with Neovim 0.10?

[flexagoon]

Neovim 0.10 introduced built-in commenting support:

neovim/neovim#28176

Does it make this plugin redundant? If not, the differences should be mentioned in the readme.

[ouuan]

A notable difference is that the built-in comment does not force the single-space inner padding. This means that comments would be //comment instead of // comment, and uncommenting // comment may result in comment with a leading space. This might be fixed in the future. Now you can use this workaround.