But -— even if not observed -— the Jubilee year was commanded, was it not?
Commended? Absolutely.
Many Old Testament scholars believe that this, and similar idealistic parts of the Torah were actually written during the Babylonian exile as an exercise of national catharsis...soul searching over “why did this happen to us?”.
In other words, seeing this national calamity as punishment for having failed to live up to admittedly very high standards.