With connected household devices, users get more possibilities and manufacturers reach a broader audience. Thus, it is simply an additional sales market.
For example, the beeping of finished devices is not always useful or there are groups of people who find it disturbing. A connected device can be quickly adapted to the very individual needs of a person. Software operation also opens up possibilities and combinations that manufacturers had not even thought of or simply had no space left for a physical button or menu item on the selection dial.
But yes, nowadays we are still in the early phases of connected households with little added value.
You can also easily compare it to car development. 30 years ago, people were happy just to be able to buy a car without any frills, and most were happy because it simply drove. Nowadays, you don’t even show up without air conditioning and central locking. No one will buy such a vehicle.