"Important" only makes sense as a comparative question here, since numerology doesn't produce a single verdict number — it produces several, each covering different ground. Asking whether soul urge matters really means asking how it stacks up against life path, expression, and personality numbers within the same chart.
Most numerology writing treats the life path number, drawn from a full birth date, as the anchor of a reading — the broadest, most frequently referenced figure. Soul urge sits a tier below that in most treatments, valued specifically for what it claims to add (inner motivation) rather than as a standalone headline.
Where soul urge does get elevated is in relationship-focused numerology, sometimes called compatibility work, where practitioners argue that shared or complementary desires matter more to a relationship's dynamics than shared life direction. That's a values claim about what makes relationships work, dressed in numerological language.