Because it is the highest form of yoga and most fulfilling and the most complete. It is the very purpose of life and others are secondary purposes, so the purpose must not be put into back burner, and should be always kept in mind.
Pure devotion is vry difficult to find in today’s times, Srila Prabhupada, Saint Tuka Ram are some personalities which are worth reading about
sant tukaram - Google Search
prabhupada - Google Search
There are movies based on both of these personalities. They are a must watch if you seek some level of fulfillment and purpose in life.