Grant is taking on a lot in this story. The hero, Martin. is a baron, trying his absolute best to not contribute to the inequality that English society is entrenched in. Lolly has some more forward-thinking views as well, though they are not quite as developed. As they get to know each other, they engage in many philosophical discussions, ones that read more modern than my expectations of the Georgian period. According to the Author's Note, this anachronism feeds into the fantasy of the genre, and I respect the vision.
Frankly, though, I don't think she needed to have that caveat at all. The gold standard for works set in this era, Jane Austen's books, were contemporary fiction, looking at modern issues of the 1810s. I see no reason why characters from Georgian times would not discuss things like slavery, sharecropping, classism, and sexism. We often do not extend the courtesy of thinking people from centuries ago cared about the same things we do, and that is a disservice to history.
I think the book works, overall, though it might have benefited from having a smidge more length to grow the relationship outside of philosophical agreement. The epilogue made me grin, and I'm curious where the series goes in future installments.