For hunting,my personal belief is that nothing beats a 4" feather.I also don't like the WB,so feathers are the perfect choice for me.To be honest,feathers tune better out of a WB but replacing them every other day would be a pain in the you know what so Blazers are probably the best way to go.
My fealing is they are way too stiff which will result in some loss of forgiveness at some point.How many times have you seen on here complaints about hitting the cables or rest or whatever else with them?
I did some extensive penetration test a while back and for me,I found my fletching choice made the biggest difference if my arrow came completely out the other side or not.Many times the fletching hung up when feathers blasted right through.Both would result in dead,easy to find deer but having the arrow laying on the ground means I get to reuse my arrow and not have the deer break it.

Blazers are taller and stiffer than regular vanes(I was using low profile 3" vanes)so they would probably hang up more but they were not even available when I tested.
So I basically agree with the "pro" but that doesn't mean he is right,or that I am.BUT,in no way do I feel Blazers or the WB won't work,but in both cases,IMO,they are both overhyped.But so are fall aways.
He needs to help you and provide you with the service you ask for,if his opinion is asked for,then he can give it,without being condecending.