If, instead, Hubski gave a new user the ability to craft a page based on his interests and then get exposed to new things through people they follow - now that would be something.
And in your estimation, this would be accomplished by the new user entering or choosing from a list tags that may interest them, which the search function would then parse and decide other related tags that have some commonality with whatever was entered in the first place?
For example, I enter science, and the engine says, "You may also enjoy these tags that have been used recently: #space, #biology, etc..."?
As to your last line, I agree with you. We tried removing tags for a while and it was a failure. I supported the idea at the time, and I was not correct. I see tags and users as basic equals. I think more degrees of freedom is better, for the most part. The two tag idea was a compromise that I would like to see abolished. Not sure how likely that is, because I'm in the minority on that.