What worries me is that FSD in Tesla does seems to sometimes introduce problems in the driving behavior with new updates. I have not experienced this first hand ( don't own one ) but I am following the r/TeslaFSD and it looks like new versions are sometimes regressing on situations that were handled correctly on older versions.

This leads me to believe that FSD is not yet solved to the level we thought and training to handle a certain new thing correcty can degrade handling of other situations