Going back to this comment as a staring point.
I think the optimum amount of time to train per week is 10 hours. Lydiard etc and other old school heads say 100mpw OR 10 hours, whichever comes first. Most of us can't run 100MPW in 10 hours but we get a tonne of benefits in running for that amount of time per week.
Now, back to workouts vs volume. In my mind, one can't exist without the other. The ratio between the two can be debated until the cows come home but if your 10 hours per week are just easy jogging for 52 weeks of the year you better not be surprised when all you're good at is 10 hours of jogging a week. You NEED variety. Even if it's one fairly relaxed tempo per week and 1 'session'. Hell it could be 6 days easy and one Marathon specific long run and you'll do ok but not just 7 easy days per week jogging.
I do think however, that volume goes a long way. And that links in with the 10 hours dedicated to running per week. Even at a very slow pace you'll cover a decent amount of distance in 10 hours.
So golden rule/formula from my understanding would be:
1. get comfy with 10 hours per week
2. add some marathon pace miles into your long run
3. add some LT intervals or 'speed' type work
oh and while you're at it, make your easy days, easier by splitting the run into two. 6 + 4 miles each day for 10 miles. You'll do well at all distances off that training.
And Brazier and the other Bowerman boys do loads of miles not just 35. That's laughable. Maybe they record 35 miles of quality work.