For me, (1) and (2) are linked. I dabbled on LW, and presented some of my own ideas in the comments sections. None of them piqued anyone's interest, even if they were on pillar topics like FAI. I stopped being interested in LW, because:

• EY stopped being as active, and no one with his clarity and perspective took his place as an article writer. I didn't see as many interesting ideas to talk about.
• I wasn't able to engage others in the comment sections. I didn't see anyone I was on the same wavelength with to talk about the ideas I did see.

I don't just come to a site like LW to self-improve. I come to engage with intelligent, rational people. I don't get the new site layout. The "Posts" vs "Discussion" split appears totally arbitrary now that they are parallel. Is this place a wiki or a forum or a social news site? Everything is very unfocused, and there isn't enough of a userbase to keep that many interesting discussions going. I check in maybe once a month now, and it looks more and more like a knowledge-management site than a discussion forum.