As far as I can tell the brain feasts on novelty, so I don’t think we’re attention span challenged so much as the distraction, associative drive brain is constantly bombarded with a million and one things competing to distract it!
Therefore, I see intention and goals as ways of tricking the mind to help us get where we want to go, rather than being at the whim of whatever association or stimuli is floating through our heads in the moment.
Another thing is, we seem to be able to effectively drop thought to the degree we’re calm.
Wiser people than me often say when we’re revved up internally, it’s a sure sign our thinking is off, and to take a pause for the cause. Just breathe.