Your coach has you doing lots of SST workouts. With the intensity in check you can put in more hours during the week and manage fatigue. Those that put in 6-8 hours a week normally hit it pretty hard with lots of L4-L6 workouts. They need the rest for recovery.

Ive tried both schools of thought and found my sweet spot to be around 13 hours a week but both theories have worked for me so I do a mix of both...... Its really hard to get your CTL up with only 6-8 hours a week and I need my CTL around 80-90 before I show any kind of form.