I can now reveal the major reason for the revamp a week ago in how text is handled when you write a post or reply. This site now allows you to send a notification to another member in your community by simply typing @ in front of their username.
Read all about it in the latest HU Blog: blog.healthunlocked.com
I hope this makes up for the frustration experienced by Apple mobile device users...
I can see it will be handy to send a notification to a member that infrequently checks the site and for drawing the attention of several members that have replied at different places in one post where you've replied saying something particularly relevant to these members, but don't want to repeat yourself. Give it a try and see what other uses you can find for this new feature!