The flight is 17 hours
A row of three is $35 per hour
A Sky couch is $53 per hour.
if you didn’t spend the $590 or $900 on more comfort for 17 hours, would you get more enjoyment and use from it elsewhere?
if you pay the $590 for the guaranteed row of three, will you sleep well knowing that someone nabbed it for free?

Value is different for everyone

At 6’4” I would opt for premium economy any day over row three or sky couch
The Sky couch and row three are about 5’