I don't have information indicating that the Polish have any particular aversion to microwave ovens. It's essential to remember that cultural preferences and attitudes can vary widely from person to person and can also change over time. Therefore, it's not accurate to generalize the preferences of an entire nation based on the absence of a microwave in your apartment.
There could be several reasons why your luxury apartment in Poland does not have a microwave. It might be a deliberate decision by the apartment management or the previous tenant to exclude it, or there might have been a technical issue with the existing microwave that led to its removal. Alternatively, it could simply be an oversight.
Microwaves are commonly used in households worldwide due to their convenience and time-saving capabilities. They are prevalent in modern kitchens, and it's likely that many other apartments in Poland and around the world are equipped with them. If you wish to have a microwave in your new apartment, you can consider purchasing one yourself since, as you mentioned, they are relatively affordable compared to other luxury appliances.