I have my own bastardised version of FWH, whereby I throw my 60 min addition in the kettle and drain first and second runnings onto it and then bring up to rolling boil,and boil for 60 min.
Next addition is at 10 and flame out.
Same hop,same alpha added at commencement of boil for 60min with similar additions, and the bitterness level was the same (to my tastebuds) and the aroma flava profile were the same.
No lack of bitterness from the FWH'd version and no extra aroma detectable.
I still add my hops to the kettle and and sparge onto,but only as a convenience,can't forget to add em reason.
personally the whole FWH thing seems a bit of a crock to me, but that just my 2c worth.
I thought this was FWH, anyone care to comment if there is a difference?