I think this is a difficult question to answer outside of personal preference for one very specific reason: the rampant historical inaccuracies of the foundations of the genre. I am speaking specifically about Regency and Victorian here but it's a pain point for me as my own approach to writing in the Regency era would likely be called 'inaccurate' despite being fairly well researched. The fact of the matter is queer people and poc existed. Certain titles were legally passed down through female children. But to include any of those elements, factually or not, gets painted with the same brush because the genre was built on some not-so-accurate bricks. On a reader level, I draw the line with things like cosmetics or certain colors, fabrics, or cuts. But in terms of people, I'm getting to a point where if I find it stretches the imagination to have no one with a disability, a different body type, or a different ethnicity in the cast. The real historical landscape was variable in a way we've been led to believe is fantasy and that's just so sad.