Let's see here. It retains easily the best recliner F cabin in the fleet. And there's no measure that says the 738 will be better in Y. The 753 Y cabin will be be a mixed bag like it's always been. There's areas where it's the best in the narrowbody fleet, like with all the exit rows, and there's areas where it's the worst (like being in the back with a tight connection). The overall result is that it will still be arguably the best narrowbody in the fleet due to the superior F cabin. There's no objective way to say it's the overall worst.

If the end configuration remains the same as the schematic, UA decided to retain a partial galley at door 2R instead of removing it for a lavatory. And up front, there's galley space both ahead and behind door 1R. DL eliminated that aft galley space. Flight attendants will certainly appreciate it, and it will make inflight service easier.

And maybe more importantly, the lavs aren't all in the back, like the Big 3's 738s or DL's 739s.