I'm not keen on the 30 day limit either. Content we post now in the early days of Steemit will have no value when millions join later on. I can imagine there are performance issues as @samupaha says when the blockchain has millions of past posts to check. Perhaps we could have the ability to re-feature a limited number of old posts for another 30 days. I sometimes find old posts I'd like to comment on, but it's not allowed. Even if there's no reward for that it should be possible to keep the conversation going.

I expect we will see further changes and I hope some compromise can be found.