i think that in general, its a good idea. However, I feel that chinuch is the major exception to the rule because you don’t want the children questioning their own hashkafa as a result of their mechanchos doing “hypocritical things” so to speak. I mean, tznius is a really big deal, and there seems to be this major idealistic picture in the yeshivish velt of the “good girl”.
I will admit that as a bais yaakov girl myself, the “good girl” concept is pretty much the same thing as in the secular world glorifying celebrities. I don’t have a problem with aspiring to perfect one’s middos because that is part of our avodas Hashem, however, when I was at seminary, I heard girls who go to, just to name a few schools, mesores rachel, meohr, pninim, machon raaya and other places say that they weren’t “good enough girls” to go to bjj, tiferes, and hadar. That is when it gets extreme. And there girls are really good girls, however, I would not want them to be morahs at a modern orthodox zionist camp like moshava, because modern orthodoxy (and this is very much a three weeks type of post) will say that they despise chareidim, and modern orthodox jews don’t raise their daughters to wear lots of dark colors, duty length skirts, or necessarily cover their elbows and knees.
Let me know if you chap what I am saying.