On one hand it makes sense that medieval european social relations imply, well, medieval european social relations and it makes sense to use your novel (or your show) to examine those.
On the other I can relate to many people wanting to see women in medieval fantasy to be represented in some other way than constant misery porn.
Mossovy (what you though was Moscow) is more like Siberia than Moscow. Its a general area not even a city or nation state.
The closest equivalent to Medieval Russian would be Norvos or Qohor and even then its a really distant analog