How much of this is boot overhead ? maybe with time people can reach 30min level of changes in a focused 7min.
I really hate that this 7 minute workout thing is becoming a trend. It's misleading in its benefits. If everyone writing or talking about it wants to clarify and say it's only beneficial for people who are dangerously out of shape, fine, but otherwise it's stupid. Workout for 30 minutes. Please.
However, my resistante is to get started ("boot time"), once I'm dressed for a workout (that is, not in a suit or jeans), 7 minutes or 14 or even maybe 30 is not that much of a difference.
At the end of the day, if 7 minutes of cardio is all you can stand to do, you're screwed.
The patronising attitude isn't going to help anyone who has gotten that far out of shape.
Even if someone is sufficiently unfit that they can't do more than 7 minutes of cardio work in a session, they still have to start somewhere and build up. The alternative in most cases will be their fitness decaying even further.
Keep in mind that there are a lot of reasons people might be that unfit. Some will just be lazy. Others might be recovering from a serious injury or illness, and just being able to walk for five minutes to get to the shops unassisted is a big achievement.