I still don’t really see why expressing matters at all beyond eg 6 or 9 months. You can still BF loads outside of the working day, it doesn’t disrupt supply in the same way that it would do if I had tried to pause feeding during the daytime for a couple of days at 2 months in.
By 6 months plus, the baby is having all sorts of other external food as well as breast milk. So formula is perfectly reasonable as a nutritional source, alongside those other foods, surely for even “hardline breast feeders”?
It’s no trouble at all to have formula milk during the time you’re not there with the baby, and BF for the rest of the time. No need to express at all.
edited to add - I don’t mean this to criticise how other women do things at all, I’m very much “fed is fed” - I just genuinely don’t quite understand about why people express with older babies. Maybe it’s more disruptive to their supply even at that stage? Maybe there’s some worry that formula isn’t allowed?