Thanks for the warm welcome OOM!
I agree with you, but consider that people don’t just get their hashkafas from a unified priest-class of rabbeim who have received their smicha from the 70 zkeinim. People get their haskafas hachayim from parents, friends, siblings, and the society in which they live – something that can vastly vary by a factor as minute as the neighborhood they find themselves in.
So, yeah, maybe everyone is capable of learning the proper haskafas, but not everyone has access to this knowledge, and surely not everyone (including rabbeim and morahs) are equipped to teach it properly to the ones who are fortunate enough to have access to this knowledge. And so society -as a whole- veers from its original trajectory as set by Moshe Rabbeinu at Har Sinay. The further we are from the proverbial “ground zero” of the giving of the Torah with all its proper hashkafas, the larger this snowballing effect is. In other words, as more time passes, we lose our grip on the one absolute truth, and it starts giving way to the effects of society and the invasion of ideas & haskafas foreign to the original truth. In addition, our level of incapability at retaining and transmitting this Truth to our next generation is supplemented by stigmas and “societal norms” which evolve to mimic as best as possible the True hashkafa (which we are simply too ignorant to transmit properly). This is why it was accepted for Devorah to be a shofetet, for Miriam to write a shira, and for Rashi’s daughters to wear tfillin, when, if they were alive today we’d throw them in the same pit as the women of the wall – lehavdil. I hope I made sense…