Two reasons:

(1) Learning the photochemical process will deepen your understanding of light and exposure. This will carry over into other disciplines, and will even improve digital photography skills.

(2) Analogue photography will encourage you to take more care and put more thought into every image. Thiswill make you reflect more on why you take a particular image and focus on composition, which will carry over into other disciplines.

I also find that anologue images can have a greater emotional impact, both on the photographer and the viewer.