I'm not opposed to playing scales and arpeggios (this is a very large fraction of my practice on all instruments). Nor am I opposed to people who are engaged in a formal course of study having exams. What set my teeth on edge was this statement:
"It seems that when you reach a certain level at Double Bass and want to get exams, you need to know and be able to play these Dominant 7ths..."
There are a lot of reasons why someone would need to understand what the dominant seventh chord is and does, and to play through those patterns in every key, but "to get exams" seems like a side point to learning how to play music. If you're going to be a full service musician, things like THE MOST FUNDAMENTAL HARMONIC RELATIONSHIP IN WESTERN MUSIC FROM 1300 TO NOW aren't things you cram for an exam and then set aside.
"It seems that when you reach a certain level at Double Bass and want to get exams, you need to know and be able to play these Dominant 7ths..."
There are a lot of reasons why someone would need to understand what the dominant seventh chord is and does, and to play through those patterns in every key, but "to get exams" seems like a side point to learning how to play music. If you're going to be a full service musician, things like THE MOST FUNDAMENTAL HARMONIC RELATIONSHIP IN WESTERN MUSIC FROM 1300 TO NOW aren't things you cram for an exam and then set aside.