D. ONE CLICK CUSTODIAN ACCOUNTS FOR NEW USERS
Because we want our friends to be able to comment on our blog posts. This should add to the user base we currently have. Much like what happens when signing up at 3Speak. You will get the keys only if you are interested in the crypto side of things.

K. WELCOME PAGE / SENSE OF DIRECTION FOR NEW USERS
Because first impressions last. If the new user experience is crap, then there will be fewer reasons for people to stay. A welcome page will make newbies feel welcome which will help the one who invited them to explain how great HIVE is.

I. MORE ANALYTICS INTEGRATION
Being able to see how a particular blog post performed in terms of analytics will do well for us who are interested in metrics, to help grow our account. Even newbies will find it encouraging to see how well they performed. In my case, I was happy to get a few upvotes and comments for my first post. This encouraged me to post more.

:)