I didn't consider it rambling. Honestly, I feel it's a matter of taste rather than a flaw and I happen to disagree with you. I can't tell you you're right but I also can't say you're wrong. I think Bitabucket and GitHub just have different perspectives on it. GitHub and I seem to agree on the forking issue but that's a coincidence.
You did try to talk it out and give some concrete examples. I've seen big whine-athons before and your post does not qualify as that as far as I'm concerned.
I think there's the possibility that project owners may start to delete forks and create entirely new repos when the bit rot issue starts to affect the repo they originally forked from. This has it's own set of problems and I might be a little too optimistic but I happen to think there's a chance we'll take matters into our own hands on that issue. Also, I would venture to guess that abandoned projects probably weren't so great to begin with and maybe the bitrot issue won't affect them as much? Like node.js isn't likely to go away and if it or a popular project like it is abandoned the authors would probably announce it and add it to the readme and so everyone will know to start looking at forks over the original.
Anyway, the HN community obviously thought this was important or good enough to be on the front page so you must have done something right. I'm sure if you were really rambling you'd just be lost in the "new" section. I don't always agree with what gets on the front page and I didn't agree with this being there at first either but now I'm starting to come around.