Oh I definately agree with you that some women shouldn't take bc pills. Even though the hormone levels are much lower than back in the day, you still shouldn't smoke and take them for instance, because of increased risk of blood clots, strokes etc.
They are the ones that shouldn't be taking them in the first place. Taking them every day, or the 21 days on, 7 days off routine.
I meant that there is no medical reason to take this 7 day break after 21 day on, for a woman who is not suseptible to bad side effects.
The entire reasoning was that somehow a woman needed either physically, mentally, or both to have this period, or something was wrong.
In cultures in the past and present where birth control pills are unknown, or not used, women don't get this perfect 21/7 = 28 pattern.
In fact a woman in such a situation may only end up having a handful of periods in her life. She would most definately be shocked to learn that in developed countries we menstruate monthly.
Look at it this way. In older times, a woman maybe lived to be 45 to 48.
Her childbearing years were let's say 15 to 35 or 40. Twenty to twenty five years.
You had more children than now, and half of them died. A woman who married at 15 may have had 5 to 8 children. If most of them lived long enough to get to being weaned, right there is about 10 years time the woman didn't have a period.
That's not including pregnancies that ended in miscarriage, but there was no period for awhile.
Nutrition, illness could also play a factor. That might also include periods being so light and/or brief as to not be much to mention. As they got older, being irregular becomes apparant. Being irregular when first becoming fertile is common too. Plus many woman have longer cycles.
When all these things and more happened, the women didn't rush off to the doctors. They let nature take it's course. I don't think it would have been at all uncommon for a woman to eventually, between pregnancy and breast feeding and normal "getting back on track" after weaning, to have 2 or 3 periods before starting all over.
Anyway, my point was the development of bc pills artificially pushed this "normal" 28 day cycle of women, which forces menstruation according to some, in truth, someone arbitrary time schedule. In reality, some women would naturally have a cycle much quicker, others much less frequently.
In fact, just musing here, it might be better to stay on bc pills with no break for months at a time.
Since the pills are tricking the body into thinking it's pregnant, I'd guess it must be something of a shock to the inner working to every month feeling "I'm pregnant, no I'm not, yes I am, no I'm not". You take it every day, the body is "I'm pregnant", which was pretty much a normal regular feeling for it to have through the ages.