I don't disagree that —if situation permits— grocery shopping can be a good levelling exercise, to step out of oneself and (eg) compare the price of various things at different quantities...

But context is important. A lot of people can't drop everything while they're shopping. If you're rushing, don't know what you want or have a furious toddler in tow, the experience suffers significantly.

That all said, I'm surprised so many people have to turn to Blue Apron (et al) just because shopping isn't convenient for them. Don't your shops offer online services? In the UK, all the major supermarkets offer delivery and collection services at minimal cost. If you buy the same thing every week, you can reduce the total exercise to just a few minutes of engagement time.