Earlier quoted context omitted.
Fwiw, most mould is caused by buildings. Poor ventilation, leaks, no waterproofing, substandard building materials. Yes, you can avoid mould in older buildings by carefully airing out rooms and keeping things dry and away from walls. But not if the previous three tenants had a mould issue and the landlord just painted over it.
Yes, but no. We have historic, sometimes even mediaeval buildings. They weren't built with the current energy efficiency in mind. Leaving the bathroom door open after showering. Not putting furniture flus against the wall are simple measures you could take that don't need structural adaptations. I know there are plentiful of technical options but some common sense goes a long way.
Like, central ventilation is not magical unobtainable technology. Simple heat recovery even vastly improves heating costs in a way insulation never can.