Reasons for intentional concern: 1. Meet the purpose and task of attention. 2. Meet the interest. 3. Compliance of active organizations. 4. Consistent with past experience. 5. conform to personality.
For example, when you were teaching at school, a bird suddenly flew in, and all the students went to see it unintentionally (not casually). Then you knock on the blackboard, the students' eyes are attracted by the blackboard (unintentionally), and they continue to study in class (intentionally). Basically, you need to use your head, and people with a purpose are interested in paying attention.
One of them is intentional aftercare. Purposeful but almost unwilling efforts, such as blind typing, adult driving and knitting, are all high skills.