For me, the big issue is still the massive amount of gray space to either side of the area with the text. It takes up nearly half the screen on my desktop or laptop, which drastically reduces how much of a thread I can read at once.
Now some of that is the column where the avatars go, and another small bit is for the scrollbar and the two icons underneath it, but most of it is sheer wasted space.
At least AnalogSignal’s neat white space fix, along with masonite’s explanation of how to use it that a relative techno-dummy like me could follow, has cut way back on the amount of wasted space within the column where the text is. But that still only does but so much. The column itself could be way bigger, and should be.