I believe there is some confusion here between "wishing and having to." It is not the technicians who wish for the corresponding distances, but the normative requirements that prescribe them. The architect and the contractors simply have to comply with these, otherwise there will be problems. For example, the working area in front of the heater is prescribed... in front of the house connection box definitely as well, etc. Safety-relevant aspects must also be taken into account, so that a technician has enough free space in front of the house connection box if, for example, they get an electric shock....
So it is not about the distances between the washing machines next to each other, but those of the fixed installations... mostly only "in front of" and not beside them. Therefore, the planning fits with the Ypsi or Borxx, as sufficient space is available in front of the respective devices.
By the way, a recommendation: plan the house connection box and fuse box as close to each other as possible :)