Tube Fuse Oil Holes

Does anybody still do the old technique of drilling holes before tacking
tubes together to interconnect them for oiling the fuse when it's
finished? I've been told that's not done any more, because of the
realization that as long as the welds are air tight, the oxygen trapped
in the tube is consumed in a small amount of oxydation of the metal
surface inside until all that's left is nitrogen and then it's fine
without any oil inside.

Comments?

John