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It's also important to appreciate and congratulate someone who started and finished something they wanted to complete and release.

It was finished and congratulated 6 years ago: https://news.ycombinator.com/item?id=17146451

The same author also made rough.js.

So it looks like the commenter you replied to has more context than you.

True. I am not sure how that relates to my comment though. Did I seem unappreciative somehow?

I don't think they were saying you were unappreciative. They were just adding on that finishing a project is worth celebrating.