A press release about the change, which was just implemented at the end of September, reads that this is “a software upgrade that will take the Steem blockchain from its current bandwidth system to a new system based on Resource Credits, or RCs. This upgrade will enable Steem DApps to create free accounts, making it easier than ever to onboard new users and cementing Steem’s lead as the blockchain with the lowest barriers-to-entry… Hardfork 20 also improves user experiences on Steem by enabling unlimited post editing on steemit.com, allowing curators to vote on a post within 15 minutes of it being published (a change from 30 minutes) and putting more rewards back in the hands of curators by removing an unfair advantage that self-voting authors had.”
A simple chat (slack style) it's enough. Just having the possibility to send messages either single user or team (#channel). But please don't forgive to give an useful appeal to mobile app (worst error of competitors is, have a good app but totally no mobile friendly!) i would expect to have a similar whatsapp or slack app for messaging within the slack mobile app!