@mxnym Very interesting! So out of curiosity what drives you to using the X over the larger Atlas for long trips? If you would have gone with the six seater, do you think you'd find yourself using the X for short trips as well over the Atlas?
Ironically we took all three of our kiddos to Tesla this weekend to do just that. We have 1/3/5 year olds. The 5 year old was fine in the back with the 6 seater. There was definitely more room in 3rd row of Atlas for an adult, but with only one adult I could do a longer trip in the X (i think) with the 6 seater pass through. If there were two adults in the back of the X I think I might get annoyed for anything longer then 30 minutes and prefer the Atlas.
My wife and I really liked the Atlas look, feel, and tech packages... although there have been some nasty quality issues that make some of the Model X issues here seem like childs play. (ie. Engine coolant leaks, stalling in intersections, gas sensor issues, ect) Have you had good luck with your Atlas?
What ages are your kids?
We bought the 2018 Atlas in summer 2017 before we bought my 2017 X in fall, both while we knew we were planning on one more pregnancy (that ultimately came about slightly quicker than expected), but had an infant, a 3 year old, and a 5 year old at the time. We didn't know about Ride Safer Travel Vest child restraint system then (
RideSafer Travel Vest - RideSafer Travel Vest learned about it somewhere on this forum), and we probably would only just now be able to use the X for trips if we hadn't learned about it; kids are 1, 2, 4, and 6 now, with only one rear facing.
When I say trips, I mean (relatively) short trips. We don't take the kids on long trips yet. I move the car seats to the X when we're going to drive an hour or two to see family, go to the zoo, etc. I also move them to the X if we know we're going to go out locally multiple times over a weekend. If we go somewhere on a weeknight, we take the Atlas, and it's also used when my wife takes the kids to and from school (or anywhere else while I'm gone to work). The reason why we usually take the X on trips is because I like driving it and everyone else is fine being a passenger in it (luckily, we don't have the fold down DVD player screens in the Atlas or that might not be the case). If my wife wants to drive, we might take the Atlas instead (she's very comfortable driving the Atlas and hasn't gotten comfortable driving the X yet).
We haven't had ANY issues with the Atlas that I can remember; I believe it's only been serviced for routine maintenance and recalls. It's pretty low mileage, though, less than 10K miles on it while over 30K miles now on the X (probably 4 times the miles on the X if you don't round to nearest 10's).
To get into the meat of everything, though, while the X can be made to work, if I'm suggesting a car for people with multiple kids, it's a minivan, and if they just can't bring themselves to drive a minivan, I say an Atlas is the next best thing. Here are some of the kid-related reasons why: I'm 6'1" and my wife is 5'0" so we can fit the car seats in the X by NOT having one behind me, but there is SO MUCH room to spare in the Atlas with the car seats installed that our heights are irrelevant (while this forces 3rd row access to the driver side, the passenger seat can be all the way back with a rear facing car seat directly behind it). In addition to that, rear access is SO MUCH easier in the Atlas with or without car seats (granted it's previously been pointed out that that's because we have the fold-down middle row 7 seat interior), the car seats are SO MUCH easier to install (and therefore rearrange) in the Atlas than ANYTHING else I've had them in, and while I can't even understand how, my wife can reach the car seat in the middle row middle seat for buckling and unbuckling while standing on the ground outside the vehicle.
Beyond kids, though, when you start talking about fitting adults in the back, you presumably start with the second row, and I'm not sure I could even sit in my default position with one adult directly behind me and another in the third row. That's another 7-seat bench issue, though (you need to move the bench forward a little bit to have any space at all in the third row). In my experience, I've found that less true in the 6-seaters I've driven. Nonetheless, as you've observed, putting two adults in the third row of the Atlas isn't much of a stretch, but even one can be one in the X (for instance, at 6'1" my head would be touching/bumping the rear window if I rode sitting up straight in the third row).