Everyone is going to have their on opinion on heavy arrow vs lite, mechanical vs fixed, and 2 blade vs 4 blade. Kinda like Ford vs Chevy
The last few years I wasn't happy with how my bow was shooting. I was ready to sale my bow. I blamed my bow for being a piece of junk. This year I decided to dive deeper in and study how to properly arrow tuning, following the Ranch Fairy steps. The arrow tuning appealed to me more than the heavy arrow side of it at first. However during my testing, I discovered that my bow and I shot heavier arrows very well. I would not sell or get rid of my 10 year old bow now for nothing. To be honest if I would have did the same tuning on my arrow setup that I had before the heavy arrows I would have been just as satisfied.
No matter what you think about lite arrow vs heavy arrow, a properly tuned arrow, proper arrow flight, a sharp broad head, and well placed shot, things will die. The heavy arrow comes in when things happen like animals moving, target panic or other things that may go wrong once arrow is released. what works for me may not work for someone else.
Have fun with it, do your own testing. My testing helped me be a better shooter by understanding my equipment.