I think its actually a step up for Dalinar. Being responsible was very important to him personally as a leader but "I need to be responsible" can be kind of arrogant as it implies you are the only adult in the room. One of his biggest issues is that Dalinar is an authoritarian, a dictator. He's literally a warlord so this is not unexpected but it meant that he tended to solve problems unilaterally. Being responsible for yourself is different from being responsible for literally everything. Taravangian kind of went the opposite track. "I'm responsible for everything so I can't be responsible for myself." Dalinar by contrast went "I'm responsible for myself so I can't be responsible for everything."