The kind of people who are easily distracted like this are the kind of people that will be very unlikely to configure an application filter for each task. What would be immensely more useful would be a (local) AI that periodically looks at your screen, uses context clues to figure out what you're doing, and first uses social pressure to get you on track, and eventually just closes it if you keep getting distracted.

Putting the ones on the user to manage this is just adding one additional thing that requires executive function.