The 2019 version chopped out like 3 whole chapters about the main character's sister. That backstory was so important for understanding why he was so angry all the time. Without it, he just seems like a jerk instead of a hurt person. It just makes the whole family conflict feel weak and confusing. They traded depth for a faster plot and it ruined the emotional payoff.
The director cut the entire subplot about the sister's letters from the war. I mean, that was the whole reason for the main fight in the third act. It just makes the ending feel totally random and unearned now.