Sounds like another wagon type car would work well for you.
I agree with your accessement of the Buick TourX -- very nice car in many ways but L-o-n-g and not that fuel efficient. Also pricy but thanks to poor sales it discounts are easily had. Will probably be orphaned after this year. After driving one when they 1st came out, I felt the 2019 Outback was a better car by a small margin (currently I drive a 2015 Outback).
Speaking of Outbacks, given that you are a satisfied long term owner of Subaru wagon I think you definitely should drive both the Gen 5 (2015 - 2019) and Gen 6 (2020) Outbacks. While there are a few nits, the Gen 6 (2020) is an improvement in most regards over Gen 5. To improve handling upgrade your tires. If you get a Gen 5, spend $100 to get an easily installed 19 or 20 mm Subaru STI rear sway bar for noticiably flatter cornering.
With the 2.5s your mpg and acceleration will be similar to the current Subie. If you need more ommph, get the a Gen 5 H6 engine or Gen 6 XT with turbo. Of course you you will get few mgp with the larger engine. Gobs of owner info on new Outbacks here: https://www.subaruoutback.org/forums/gen-6-2020-future.233/
Subies remain quite reliable although there have been some issues with late model Subies -- most notably a small percentage may lose oil (leaks or burn it). That said the early 2000 Subies had a reputation for bad bearings and blown head gaskets, so no car is perfect. To a significant degree your reliablity is partially dependant on the luck of the draw and maintenance.
IF the Outback doesn't fill your bucket and you are OK with a sedan, then I'd steer you to the Accord followed by a Mazda 6. Both should tick off most your boxes but the Accord will get better mpg and have more room (important with growing kiddos). Also both are reliable but given all the new electronic do-dads on new cars, the is more to go arwy and more complaints when compared to a car build 15 yrs ago.
Regarding Android Auto: that seems to be glitchy for lots cars and users. Just be sure to check your android phone for compatability. If you encounter difficulties, have the dealer set it up to your satisfaction before purchase.
Happy car hunting and please return to let us know what you end up with.