Only because we use a lot of pine wood with low density (because cheap&fast). Not all wood is like that: Red cedar, douglas, larch, acacia and more... Where I live, chestnut is even used for roof tiling.
I've started seeing screw-tops as an accessibility feature after the last time I got a bottle with a cork that was impossible for my mother to open and ended up crumbling anyway. I'm done with corks forever; they just don't make sense.