You are right. I am being influenced by a leaflet that my wife was given 4 years ago about tzniyus. The ikkur schar a women gets is from sending her husband to beis medrash and sons to cheider.
I was going to post that, but I forget if that is the main schar or the method to get schar limud (which is K’neged Kulam, but possible that other mitzvos can get more).
As an additional point, this is another example how these “leaflets” and other Tznius items twist halacha towards a specific untrue, non halachic outcome. It is why Tznius must also be learned from a real Halacha sefer (if you want the halacha).
PS: It makes sense that Tznius (of action, not only elbow & knees) is similar to Limud Torah for men, based on each gender’s specific main Yetzer Hara. (I believe I’ve posted on this before).