Responses
Those are some modern point of views over pretty old customs from men, though nowadays controlling men exist, I tend not to mix reality with the story. For me the ML and the FL are not that striking as Eunice and William :)
The fact that he's using the excuse of reading her letters to protect her... I don't know how is she going to be protected, the other party is the future empress. The typical carriage accident can kill her.

bro is it just me or Edwin wanting to erase her privacy by demanding he reads all her letters before her and gets to decide what she receives or not is mad fucking weird? like unironically if i found that out id get the fuck out of the relationship like thats so INVASIVE!!! immediate deal breaker like who the fuck u think u r