To me
There are multiple failure conditions regarding fuel,
some more obvious than others e.g failure to deliver fuel to the engines, including contaminates that can't pass through filters
less common e.g fuel is deliver to the engines but in a state that it can't pass to the burners and hold a flame
even less common but in a few engines susceptible, e.g fuel that forms a residue in the fuel controls that jam tiny spaces or ports and while it still burns OK (like a trumpet horn with sticky valves) The fuel control no longer works correctly. Unfortunately this is more susceptible to the more advanced engines. The idea is to minimize the rarity of this failure condition by simply controlling the properties of the fuel so as to not create it's own particle contaminations. Also consider that one outset of this is a wild engine that commands itself to full power.at inopportune times.