Itchy.
That's a real stretch.
Re-file has been used for decades by many very reputable Airlines, Qantas and BA amongst them.
We carry a contingency fuel as part of our overall load, and it varies with route distance.
If, say, a 600KG contingency is safe for Muscat-Dubai when departing there, why is it less so when OVERFLYING muscat en-route from SFO?
It should not mean any increase in risk to the safety of the flight, It DOES increase the likelihood of a diversion short of destination, but that is a commercial risk the company is willing to take.