I actually agree with this, Sara going soft is one of the reasons I stopped watching legends. I liked the hardheaded badass in Arrow, it really made her the perfect girlfriend for Oliver, both good guys but don’t have to be nice about it.
Sara was always going to turn into a somewhat softie because of the Legends, she is like a mom to them. And I think it's really cute, she is a better person because of Ava and not just someone who sleeps with her sister's boyfriend and actually is in a healthy relationship.