Thank you so much! I'd like to try it myself, but your link redirects me to some getting started page.

Any idea why some comments are missing? I haven't checked to see if they are all there, as far as I know they are.

I know that any in closed subreddits or comments that were removed by mods might be missing. But if you can access the comment's permalink without being signed in, then it should be in your data.