It takes some getting used to, but for me I ended up not keeping certain newsletters in The Feed. The general idea is that The Feed can be read anytime, and to just "let it flow". There are certain newsletters that I like to keep on track of, so I just keep those in my Imbox.
I thought this was a pretty interesting read, especially about how they used Jekyll as a prototyping tool. It's always great to see the different variations of a product, especially a new one, as it takes shape.
There are many newsletters that I do intend to read and some I only look at occasionally. Adding to the "set aside" pile is a pain to do.
For now, I've transitioned as many newsletters as possible to RSS using kill the newsletter but it doesn't work as well as email in many cases.