Another Fantasy with a rapist male MC, and a case of “selective medieval realism”. Dragons? Yes. Mages? Why not! Women with agency or learning the art of war? Too much!
The MC commits marital rape during the first part, and this is never acknowledged by the narrative at all. Maxi disability and her abusive background only exist so she never stands up for herself. We’re supposed to think Riftan is a romantic hero. He's not a romantic hero. He is a rapist, an immature man who believes he is a legend because he once killed a dragon and looks down on the nobles who gave him his titles and his lands (because that’s how feudalism works). Who do you think legalised your possession of those lands, the goddess of the mountains?
The classic trope of the "broken man who can only love an abused woman," dressed in romantic tragedy. But what seems like an epic love story... dismantles quickly when you analyse it with a little logic:
It's not "protection", it's control disguised as “manly heroism”.
It's not love for someone shy or with a stutter; it's a preference for someone who doesn't confront them. Because Maxi knows nothing, not even the currency used in her world. She’s helpless and utterly ignorant of everything. Never mind, in real feudal societies, noblewomen were actually in charge of running the castle; most even knew about warfare and combat, enabling them to defend it when the men were away.
It's not that he "protects her from the world", it's that the world and she need protection from him. Riftan is the typical “Strong male character” from Romantasy*, he believes that being stoic, growling and physically intimidating everyone is how you run a castle. In the real world, he would have been executed for treason a long time ago.
*Isn't it funny how people use the bullshit "Strong female" term, sometimes with derision, but never question how ridiculous these male characters are? “He has a penis so he can take down a dragon and an army by himself, but a woman warrior? Too much!”
(The answer to this is misogyny).