Ask HN: Why is there no collapse comment thread feature on HN?

I use the greasemonkey script Hacker News Threadify and it works great for FF:

http://userscripts.org/scripts/show/110317

Try HackerNew Chrome plugin to collapse and related features.

Try http://hn.premii.com/.

Clicking a comment lets you collapse it or the entire thread it's in.

Works great on mobile too, feels like a native app.

I'm set to release an app in about a week that will let you collapse comments.

Will be posting it on here once it passes through review.

HN is pretty much intended to be featureless.

And what the hell is with expired links?

And the fact that leaving a comment takes you back to the top of the thread... I love HN for its content, but it's certainly not a marvel of usability. The expired link issue is ridiculous.