I think the character count for preheader text needs to be increased. It's currently set at 75, but Litmus is recommending is to be at least 90 characters. Since Emma seems to be partnering with Litmus, it makes sense to follow their recommendations. :)
Hi Karen -- I've marked this Idea as Planned. While I don't have a solid timeline on this work, I know that our Product Team plans to increase the character count for preheader text. I'll update you when I know more. Thanks!