https://www.musical-u.com/learn/whats-the-point-of-scale-ear-training/
Scale degree ear training is one of the best ways to develop your relative pitch and truly understand the musical role of each note you play.
Scales are a highly unpopular topic with most instrument learners, and this tends to have a knock-on impact on ear training, so that scale ear training is neglected.
This is highly unfortunate.
Learn the value of learning scales by ear in the full article.