@demofox @glassbottommeg In Warsaw after the war a lot of apple trees were planted on purpose. They were then left to grow on their own. Their fruit is small, hard, and on the sour end of the spectrum.
At the same time, crumbly bred varieties are totally a thing. I don't like them, but some people here love them. They're also considered best for proper szarlotka (a kind of apple pie).