The problem I see with FL is the ability to get it inside of places its not easy to wipe out excess of. This is not as big of issue with conventional lubes that aren't as succeptible to thicken in the cold. If you detail strip and apply FL as directed by wiping away ALL excess it works well but I personally like other lubes better. There are some enclosed parts you simply cannot take apart to remove excess FL so it's not an option. Enclosed rifle triggers come to mind.
