Fridge quality today is lousy enough (and warranties + return policies have all but evaporated) that spending money elsewhere would've been a big win. Even if we're not talking reliability, I had to replace a 20 year old fridge with split shelves only to find that this feature is now only available on more expensive, less efficient, less reliable bottom freezer units. Another modern fridge I've dealt with recently (Whirlpool) was just breathtakingly poorly built. It worked, but imagine if Whirlopool had sunk money into QA instead of gizmos.
Presumably your built-in temp sensors are WiFi or bluetooth. What are the chances that's gonna get updated when the next WiFi standard starts to become more common? Will it support the next version of WPA? What happens when the power goes out?
When I had to diagnose a dying LG fridge, I got some cheapie ($20ish) RF temp probes. They're battery powered, the included receiver can set an alarm, and a cheapie software defined radio kit can decode the signals on Linux. I run rechargeable NiCad batteries in them and have moved them from the LG to a couple fridges since. Hands down a way better (and more robust) experience than anything a fridge manufacturer could dream up.
Door open alarms are comparatively much simpler and a good example of a feature with a much smaller inherent downside.
BTW, I'd also add that folks (not necessarily you) championing flashy features are forgetting just how dead nuts simple fridges used be. To the best of my knowledge my current fridge (Frigidaire / Electrolux) has a mechanical timer for the defrost cycle. The LG uses electronic controls to eek out a bit more efficiency. I know which one I'd rather replace.
