I'm under the impression you are French. If so, you can always send me a message privately. I speak perfect french.

As to not being able to absorb more estrogen and that "too much" is useless, it's not true at all. Facts contradict this...otherwise, why do womens' levels increase during pregnancy and affect so strongly the body? If it was useless, then why would the body ever produce more and more? I've noticed better breast growth at
higher doses typically not prescribed to transwomen, but approved by my doctor and none at lower doses. So, the extra can make a difference.
I will cite you another example. Prostate cancer male patients. Why are VERY high doses of estrogen given to them if the extra is useless and could potentially carry more risks? Because those prescribing them the estrogen understand that the extra MAKES A DIFFERENCE and also understand that bio-identical estradiol unlike other forms is much less risky, especially considering that it is given non-orally.
As to the role of progesterone, who knows whether it makes a difference? But these studies make one wonder...
From Bull Assoc Anat (Nancy). 1995 Mar;79(244):23-7.
"These data indicate that the proliferative stimulus of the mammary lobule is more intense during the luteal phase of the normal cycle and may probably be due to a synergistic action between progesterone and estradiol."
Breast Cancer Res Treat. 1996;40(2):187-96.
"The breast tissue from women operated on in the luteal menstrual cycle phase (day 15-28 among oral contraceptive (OC) users) had significantly higher proliferative rate than breast tissue removed from women in the follicular phase (day 1-14) (p = 0.01)."
Breast Cancer Res. 2005;7(3):R306-13. Epub 2005 Feb 16.
Assessment of the proliferative, apoptotic and cellular renovation indices of the human mammary epithelium during the follicular and luteal phases of the menstrual cycle.
"However, the cell renewal index (CRI = PI/AI) was significantly higher in the luteal phase (P = 0.033)."