I saw a comment on HN sometime back and can't seem to find it now, but thought it had some merit. The gist of it was that enabling posts from mobile might lead to lower content quality as typing on phones is tougher and we tend to focus on a quick reply rather than a thought out discussion.
I personally use http://hn.premii.com on mobile & it has a good reading experience.
It's an orthogonal issue. I would like the official site to be vaguely readable on mobile. Whether they then choose to discourage posting from mobile is a different question.
(My personal view is that 'mobile' is very difficult to define. If I connect a bluetooth keyboard to a Galaxy Note then why the hell should I be discouraged from posting on the grounds I might post lower quality comments?)
Even on my 7-inch tablet, mobile sites are mostly just a pain in the neck. I'll almost always prefer to be served the desktop version served to me (exceptions for sites that expect me to hover my mouse over their content.) In my view mobile sites should mostly be "small display" sites, and they should be served to desktop people with small browser windows, too.
Worst of all are sites that don't provide a "Full site" link, and don't cooperate with my browser's "View desktop site" option. And don't get me started on "Try our mobile app"...
I used to use hn.premii.com since sharing articles from there shares the hn.premii.com link which seems to steal the page view from the authors post - I may be wrong though.
I use the HN Enchancement Suite chrome extension[1] now instead on my desktop and cheeaun.github.io/hackerweb on my mobile.
I personally use http://hn.premii.com on mobile & it has a good reading experience.