If you are a fair-dinkum student you should get a new instructor or preferably, change schools.
The safety record of aviation is founded on self discipline by all involved. No, the radio stuff discussed here is not going to kill someone but as others (above) have said, there is a correlation between a lack of discipline and safety incidents.
Head-on collisions are pretty rare and everyone knows to keep to the left. Should we get rid of the white lines on freeways? ...no, because - as you said -
it's written in the AIP's but few use it to the letter. Humans I find are not machines..
When you get older and you're raising toddlers (or teenagers) you will understand the importance of setting a standard or a boundary and enforcing it.
When you are a chief pilot you will understand that in many ways, the distinction between toddlers (or teenagers) and pilots is often very, very slim.
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