Our 19 has had it's share of issues but all happened early on and were taken care of under warranty (cam phasers/20k, transmission rebuild/25k, alternator/25k, catalytic converter/26k, mileages are probably not completely accurate but should be close). There was a nagging issue where we experienced a lag in power while having the boost gauge max out during acceleration that seemed to only happen when traveling around Houston during the summer, which I've posted a few times on this forum. We were never able to get it diagnosed since it acted normal once we got back home but I was suspecting a VCT solenoid. When it finally got bad enough they diagnosed and replaced the passenger side VCT solenoid and it's been running great for the past 4 thousand miles or so. Now that warranty is up I'll be doing most repairs myself. I had a leaking inlet heater hose that I replaced a couple weeks ago for $75. When cold the transmission lags a bit shifting from 2nd to 3rd but it seems to do fine after the initial shift sequence or by using sport mode, which I pretty always do. We only have around 63k miles on ours so it should have a lot of years left. Overall it has been a good vehicle for trips and hauling people and lots of cargo. We plan to hang on to it for the long haul but may pick up an Aviator for my wife to daily drive at some point while keeping this one for road trips, towing, or hauling a bunch of crap.
I would say if you are looking try for 2020 and up, supposedly they were better but check service records and see what may have been done under warranty. I think issues generally happened at lower miles for 2018 to 2020 models so if they've been resolved then you should be good to go. I'd like to run this one up to 200k+ but the amount of miles we drive that will take a while, especially if my wife got a new daily. I drive a 2024 Bronco so if she got something else I may split driving between the Bronco and Expedition to save a few miles since the Wildtrac Bronco is no longer offered and the 2.7 is becoming a limited offering. I could also leave the top off more since I have to throw it back on whenever rain is in the forecast.