I'm 44yo. I had every menopausal symptom in the book.
I couldn't think, couldn't read or concentrate, couldn't put two words together or work, felt permanently jet-lagged. Night sweats. Flatulence, like old lady farts(!), constipation and a slow gut - chronic and despite fibre and all the obvious things tried. Heart palpitations of the skipped beat kind. Zero libido. Dry eye, dry mouth. Migraines (only had one since starting HRT in March when I would get them many times a week before.) Joint pain in hands, knees and hips despite normal x-rays and bloods. Inexplicable weight gain. Like I could eat a single apple a day or something and somehow put weight on, something really freaky was going on with the metabolism. And I couldn't see the point in looking forwards to anything. I felt like I was 80 and just wanted to sit in a rocking chair by the fire until it was time to die - it was horrendous.
Estrogen has stopped all that. Which is why I just can't go back there and I'm so stressed about these estrogen symptoms. The good news is they all went away pretty much at the 25mcg patch, so if I do have to go right back to that, hopefully things will still be okay as far as symptoms go.
The article doesn't imply that progesterone is low because we stopped ovulation, it's more that they believe that progesterone only really shoots up high after ovulation during the luteal phase. So if you stop ovulation, you stop that progesterone increase and your body from experiencing that. And their theory is that this predisposes women to bad health in old age, from cancer to cardiac events. It's only a theory though.