Flew the B744 for ten+ years with SQ, never had extra fuel loaded queried once! Knew of a few on the B747-300 that did get into hot water but adding 5 to 10 tonnes on Japan and Australian flights and citing, "That's how I like to operate" isn't going to endear you to the management of any airline I would suggest!
Did get sent to Europe on re-dispatch with only 1000kgs contingency sometimes and was not too happy about that - but it wasn't an unsafe practice, if, at the re-dispatch point you had less than legal fuel required to reach final destination then you were obliged to tech stop and possibly require a crew change.
Provided you had your calculations correct there is no come back.