Originally Posted by The Lev

You neglected what might be the most important part for many travellers:
"...the carrier opted to roll them out on two new higher-density 777s it will take delivery of next summer."
With the addition of PE, you can only achieve higher density by some combination of reducing the number of J seats and/or the introduction of 3-4-3 and/or less seat pitch. All would be a downgrade for most travellers.