Looks like a good replacement for Sage, however Id' also suggest a compact, no-frills "two-column, left one split into upper and lower half" layout: https://imgur.com/a/dslQ8
The current "Layout 3" comes closest to this, but it wastes way too much space.
Note that you can hide the feed tree (shortcut 'w' or click the 'three lines' icon in the upper left-hand corner). You can also resize the middle column (article titles). That leaves plenty of space for the article itself.
