suppose a department manager, he doesn't want to be the kind of person who focuses on details. When he says

I suppose I can be a little bit careless sometimes.

Does that mean he think he put much more time/energy on details than what is supposed to be?

suppose a department manager, he doesn't want to be the kind of person who focuses on details. So he says

I suppose I can be a little bit careless sometimes.

I am afraid that the word careless is not appropriate to use when talking about work, since it usually a bad word.

Cambridge Dictionary gives this definition, which could be a proof.

not taking or showing enough care and attention

Is my understanding right?