It really depends on the context we are talking about. For digital design it could be a way to detect when the user is overusing the product for long period that might be actually harmful in long term. It can be from simple notifications that can be snoozed to more direct ways of cutting access to the product that will create a buffer period.
There are 3rd party apps/extensions for browser like “Focus” that can be helpful. The question is why we as Designers don’t think and incorporate such solutions in the product itself.
Physical products and environment are harder to design in that aspect.
Thanks for taking the time to read the article, Arnau! :)