Some of the J folk might do nothing in between but at least they're guaranteed to get away on det several times a year and rack up the hours & experience there (even it is on endless Quattro Bastionnes). All LXX could hope for was one route sector every three months.
One could argue that if we spent less time and effort trying to resurrect dead Ks in the Marshalls Pet Semetary then we would have more
Js serviceable to keep everyone ticking over. As it is we blow 40% of our effort on keeping 2% of the aircraft flying which in the end just disadvantages everyone.
Couldn't comment on other ME fleets.