This is not my experience in 16 years as a working mum. Nobody else stays late to cover my work, it’s still there for me to do after my child is in bed.
The main issue is those who engage in presenteeism think that just being in the office longer equates to them working more.
My opposite number is a man same age as me, with no childcare requirements. He’s has one project to run. He’s in the office at 7.30 and rarely leaves before 6, every day. He frequently misses deadlines, never picks up any of the room management stuff, we often have to draft in additional staff to cover his workload when he is behind. I WFH 3 days and in the office 2 days. I get in at ten and usually leave about 4.30. I have 4 projects a similar size to his, carry all the management stuff, meet every deadline etc. On the face of it, his office hours would suggest I work less than he does. That just isn’t true.
The only thing my team have to do is, be aware if they want holidays during the school holiday period, to run them past me first as I am restricted to those for having time off. They know to avoid first two weeks in July if they can, but even if there is an overlap, we can make it work.
It’s laughable to think women are giving less to the workplace simply because they need flexible working. It is largely untrue, but don’t you worry, by every metric, their career trajectory suffers because of it so all of you pretending you cover our backs are well rewarded over time.