Then why not 1:15 for a developing time all around?
One of the biggest keys to fine print making is consistency. I would go so far as to advance consistency as one of the most important aspects of actually having a bit of control in arriving at an intent with ones work. Everyone gets to do what they want, of course, and can justify it any way they want.
I however, for one, would never consider arriving at an exposure using a method that varies in some way from the way I expose and develop my final print, and if I was teaching someone to print, I would discourage such a practice. YMMV.
Amen to that!
Could not have said it better than that myself.
There are no shortcuts in fine photography.