Because they are designed to be installed for decades, they also evolve at a slower pace than typical consumer appliances. If something breaks 15 years down the line, the manufacturer either still makes the same part or makes a compatible replacement. They are sold under the assumption that they are installed long-term.
Sub-Zero explicitly markets their refrigerators as being designed to last at least 25 years.
They have fewer features than Samsung feature checkbox fridges on purpose.
An automatic door close function would also be potentially dangerous with a built-in custom panel refrigerator like mine. My fridge has more pinch points than a normal fridge because the cabinetry is designed to be seamless.
A temperature control is a dead-simple and basic smart function that’s easy to implement. Automatic door closing would be a complicated mechanical mechanism prone to failure.
I will also note that I didn’t choose this fridge to be a snob, I chose it because my home already came with a custom panel refrigerator that needed to be replaced (a garbage piece of shit from Viking that wasn’t worth repairing, side note, I hate that company even more than Samsung). If I replaced my refrigerator with a normal one I would have had to do additional carpentry work on my house to avoid the area looking gutted so to speak, and I would also devalue my home since luxury built-in custom panel appliances are features that show up on real estate listings and they are a “luxury” indicator to buyers.