Count the parts in the milk system
This is the single best predictor of whether a super-automatic ages well. A two-part carafe that comes off and rinses under a tap gets cleaned every day. A system with internal tubes and an automated cleaning cycle gets skipped on the days you are late, and skipped milk systems sour, block and eventually need servicing. Fewer parts, fewer excuses.
Ask whether the brew group is removable
A removable brew group can be rinsed under the tap weekly, which keeps coffee oils from going rancid inside the machine. Sealed brew groups rely on automated rinse cycles and a service visit when that is not enough. Neither approach is wrong, but a removable group puts the machine's lifespan in your hands rather than a technician's.
Burr material changes the coffee more than the drink menu does
Ceramic burrs stay cooler and dull more slowly than steel, which matters in a machine that grinds directly into the brew chamber seconds before extraction. Meanwhile the difference between a machine offering eight drinks and one offering fifty is mostly software: most households settle on two or three drinks within a fortnight.
Water hardness decides your maintenance schedule
Scale is what kills these machines, and how fast it builds depends on your water rather than the brand. A machine that takes a water filter, and an owner who actually replaces it, can go many times longer between descalings. If your water is hard and you ignore this, you are choosing a shorter life for an expensive appliance.
Measure the depth, then measure it again with the lid up
Super-automatics are deep, and many fill the bean hopper and the water tank from the top. Under a wall cabinet that means a machine you pull forward twice a day, which is precisely the friction you bought a one-touch machine to avoid. A front-loading water tank is worth looking for.