That is correct. The only time they may actually hold the flight is if it is the last one out for the evening. Morning and middle of the day, nope. That in turn messes up all the other flights that plane does that day. Delta schedules their planes with minimum ground time during the day. They do not want planes sitting around -- they want them in the air making revenue.
You live it ATL, but have you ever had to make a connection through there?
Breaking it down. Say it was a good day and you land on time. Deplaning door opens, you have 41 minutes. But, minus the 10 minutes due to agent closing door for connecting flight. That gives you 31 minutes. Same concourse, yes you and your family could do it. Switching concourses? Solo, it would be a race because you have to give yourself 15 minutes to get off the plane (unless you were in the front) and then 16 minutes to get to your connection. If you're going from Concourse D to Concourse A, 16 minutes is really tight. You'd have to hit the "plane train" and not wait. And you may have to carry your bag up the "escalator to heaven," then run to the end of the concourse for your connection. OP is going on a family trip. You add another person into that equation, forget it.
Oh, and it can be wall to wall during peak season. Not to mention the electric carts to shuttle those who can't walk long distances. Those drivers are ruthless at times.
41 minutes is tough if you're on Delta. If you get lucky and connect in same concourse you could likely make it, barring no delays. But you won't have a crystal ball to know if you'll be in the same concourse -- the same flight could be in concourse B one day, and A the next. If you are in the back of the plane
and switching concourses, no way. Add in the fact you're not a seasoned ATL traveler, don't do it! (I have witnessed the bewildered and stressed more times than I care to discuss. I find it one of the absolute easiest airports, but if it can be intimidating for a first timer.)
As for the Flight Attendant. Yes, I have made announcements on arrival to help those with close connections make their flight. Do you think it actually works?
It doesn't. Just like people want to be first on, they want to be first off. Sadly, many of your fellow passengers don't give a rip.
I wish it weren't the case, but I have seen it enough to know the reality. And we don't alert any gates that you are coming. The agent can look on the screen to see where you are, but their main priority is to get the door shut at 10 minutes prior.