I could be missing something, but I don't think the seat layout pictured in this thread makes sense for a 73G. However, if you ignore the E+ labeling, it's exactly the right layout for the 735 without E+.

According to SeatGuru (which usually gets its geometry right, even if the advice is debatable), the E+-configured 73G has 3 rows of F and 18 rows of economy seating (7,8,10,11,12, and 20-32), while the non-E+ version has 3 rows of F and 19 rows of economy (7,8,10,11,12,14, and 20-32).

This layout has 18 rows of economy, but gives up a row of F. Why? There's 36" of missing space -- enough to make the whole economy section E+, which ain't gonna happen.

I also notice that Row 14 is suspiciously wonky. It doesn't have E+ spacing, and it's either blocked out (likely) or completely booked (unlikely, since the rest of E+ is wide open). I think this is a franken-seatmap -- possibly intended to be a placeholder because they don't know which kind of 73G is going to fly this route. Or maybe just a computer error. Or (most likely) it's a 735 with no E+ (in particular, note that the bulkhead in front of 1E/F is a closet, not a galley as on the 73G).

Point is, there is no plausible reason to take out a row of F while keeping only 18 rows of E/E+. If the seat map showed 19 rows of Y, the OP would have a case, but it doesn't.