You're both forgetting that if one person has hard objectives, another has easy objectives. That's how it is now, and most likely how it would be if a new way of calculating objectives was implemented.
The reason I like it the way it is now is because it takes skill into account when calculating your objectives. Not just skill of strategies and in-race stuff, but picking out the right drivers and having a good design plan.
If it was solely based on qualifying, picking drivers which are lower levels but still as quick as others would be irrelevant, so people who are 'better' at the game would find it just as hard to reach their objectives as those who aren't as good.