Delta Air Lines' new Airbus A321neos: 44 first class seats & only 1 lavatory?

What is the reason behind Delta's latest and odd domestic first class configuration on board the A321neo?

Delayed again: Delta to keep 44-seat first class A321neos until 2028 as lie-flat seats slip further

The decision to keep the 44-seat layout comes right before the summer travel rush.
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Delta Airlines Surprises The Industry — And Perhaps The First Class Traveller Too

NEW YORK - AUGUST 24 : An Airbus A321 operated by Delta Airlines takes off from JFK Airport on August 24, 2019. (Photo by Bruce Bennett/Getty Images) (Photo by Bruce Bennett/Getty Images) Airlines ...