You dont need buff in all aspects, and you would be putting fires on areas that will bite you and your engineers ass.
With a good buff engineer with buffs on needed areas, more pilot tools will help more than replacing a tool that keeps everything buffed but puts fires on components whenever it is selected.
If you dont have buff on selected components in combat, thats not a good buff engineer (Dont imply that the buff engineer buffs during combat, its pre combat)