Not sure I fully understand what does the sidebar mean in that case. I can see it on the main page at the right, 'Recent topics' and actually for me it's quite handy - I can recognize new threads which have been created recently. But I thought it's the only place where you can see them.
Oh I see. So in this case if you will leave the sidebar only on the main page I wouldn't mind it. And I doubt I ever noticed this on topics before Premium as well.