Yes, a decentralized system has no place in a new building, there are basically only disadvantages (many holes in the wall, louder, I have never heard of an enthalpy heat exchanger there either, …). The controlled residential ventilation does not dry the air, but pulls in the dry air from outside, and due to the large air exchange, the air inside the house is correspondingly drier when the outside air is dry.
Solution 1: Enthalpy heat exchanger, which has a certain moisture recovery (but does not necessarily have to be sufficient, but increases the room humidity by several percent)
Solution 2: Proceed as homeowners without controlled residential ventilation do. Turn off the system (would not be a solution for me) or reduce the air volume a little in winter.
Solution 3: Actively humidify.
Personally, I prefer a combination. I consider enthalpy heat exchangers an absolute must, it already helps without any disadvantages (in addition, you save yourself a possible preheating register, as icing is almost excluded with an enthalpy heat exchanger). In addition, I have a humidifier in an exhaust room, which humidifies the air and the system distributes it through the enthalpy heat exchanger in the house (but this is only necessary for a few weeks a year when it is really cold and the air outside is dust-dry). I do not want to reduce the controlled residential ventilation, because I enjoy the fresh air that is in the house at all times, e.g. in the morning right after waking up.
Regarding dust: You have less dust because much less comes in! The air goes through filters, with normal window openings everything comes in that is just swirling around, including insects. This is also another advantage of controlled residential ventilation, significantly fewer insects in the house in summer, since there is no direct need to throw all windows wide open because the air in the house is not so great.