My goals are different than most, and admittingly, I go against the grain on many occasions: For example: In one week per day I may eat 7 meals each day. The next week, I may eat just 4 per day, and the next 3, and the next 5. Why? Just to keep my body saying WTF?
In addition, when I was in deficit to lose weight my deficit calories per day....were NOT the same amounts.
I never plateaued in weight loss in the 30 lbs I lost. I never had to eat over my MT line like "some" have to at some point in their personal journey. (edit: I did have to, when my fat percentage got low...this was a DIFFERENT beast)
My point here is my main attention was on calories first and nutrients a close second, and one doesnt have to get that technical to lose tissue. If fat loss is the primary goal. (in the sense your speaking, though I did get technical in the caloric v activity ratio side in my journey)
On the issue of muscle growth. This to depends on what one's goal is and what one wants to maximize more while accepting a side negative product.
At 46 I dont want to be in the huge bulking business. So,I set out to learn my body, and over time I have done just that.
I gained 4 lbs in 5 weeks (end of July to end of august), and I gained no fat weight--repeat no fat weight. Now ask me how I managed that?