The problems with #2 and #3 are they are equally, if not more, valuable points to those wishing to hide their identity for nefarious reasons instead. I.e. that nameless "just makes you think, doesn't it" kind of farming. Identity (as in an account history) provides not only a community here, but easily rules out a lot of malicious wordsmithing concerns. Not that I place any of that on you in this case, just the general use of throwaways as perhaps not as net-good for the site as advertised above.
Nothing wrong with #1 on its own of course, but if we're talking about what we'd like to see here then I'd lean more towards the value in discussions with individuals in the community than the value in the prose of the articles/comments.
On that note, if anyone ever suspects a certain account/comment set as actually being nefarious, the note to reach out to hn@ycombinator.com in the guidelines is no lip service - they really do look right into it and get back to you (often with speedy action about it too). It's by far the best action you can take to keep the community feeling in the comments when you think it's actually occuring!
Nothing wrong with #1 on its own of course, but if we're talking about what we'd like to see here then I'd lean more towards the value in discussions with individuals in the community than the value in the prose of the articles/comments.