Thanks for the new site. Sad to see Somersoft go. I'd like to see the post count and join date of forumites on each post, so you get to see if the poster is a newbie or an old hand. It helps me put questions and replies into context. It will also help identify trolls/people with agendas, too.
I've noticed there's a few variances on phone vs bigger screen such as laptop or PC. One of them being on phone I realised that you can't see who made the last post in a thread but big screen you can.
The responsive design makes some compromises to cater for smaller screen sizes - if we tried to include all the details on a small screen, it would simply become too cluttered. You can always touch the avatar or username of the poster to pop up the "member card" which shows these details.