There are no good 19th century roleplaying systems. Everything is D&D slop or mudcore slop. Even GURPS fails to understand the point. But never exactly on that point in which technology isn't too old but social systems aren't too modern either. The closest I can think of was Disco Elysium. Currently I'm in the process of creating my own 19th century setting in which all the slop above "fighting le hecking rebellion" is looked down upon. Just like in real life, rebels and anarchist are terrorist with brainrot from propaganda which actions often take down innocent people instead of the "tyranny" they're fighting against.