I think the concept can be applied in context at a broader level. In Einstein’s time, there was no Internet full of distractions, apps, notifications, email, et

I think the concept can be applied in context at a broader level. In Einstein’s time, there was no Internet full of distractions, apps, notifications, email, etc, and TV and radio was there but not nearly as compelling as it is today. So one could argue that the activity of sitting around thinking about nothing for a while (aka being bored) was baked into the normal daily experience. It’s only in modern times do we need to invent the “activity” of mindfulness to regain that pattern.