Where to start really?
The fact that it implies a hierarchy of parenting with the assumption that if you're not physically present as much as someone else you're not doing it right?
The implication that if you work in a demanding job you've somehow abdicated some of your parental responsibilities?
The implied acceptance that there are some jobs that simply cannot be adapted to combine with meaningful parenthood (whatever that might be for a particular family )?
That I strongly suspect it is a phrase used much more often in relation to women than men even though it supposedly describes what very many men actually experience (OH doing all the day to day stuff).