From Robb Knight’s most recent blog post:

Why am I making a blog post with the same information as the Reddit thread? The reasons are twofold:

1. I’ll probably need to reference this in the future.
2. I can’t rely on a random Reddit thread (or two in this case) still existing in a months time, let alone a year or more.

That’s pretty much the same reasons why I repost instructions I found elsewhere here too (with proper attribution, of course). I’d also add that explaining the information yourself helps, just so that you know you know it.