The newer composit breeds.I read where I think it was F.L.Sewell who said on this very subject about 1910,"Some of them were not made that well the first time,that they could not be remade better all over again". I am sure that was true in some cases.Other cases came about gradually over a long time,perhaps doing it the hard way by trail and error without a prior plan,(like the Barred Rock). Others came more from selection from the tough survival landraces,(like the RIRed).
I think with the prior road map,some could be re-made faster and perhaps better by avoiding the pitfalls from the first time,the Lamona comes to mind,perhaps using White Dorkings instead of Silver Gray.The salmon breasts and pile markings were persistent.
I think if we are careful,we can preserve and improve the composite breeds and then any idea of remaking them would not be needed. There are just some ingredients that are no more and perhaps the final product would not be as good.For example the old utility Buff Cochins,utility Light Brahmas,and single mated old fashion Brown Leghorns,are no more and they were key factors in many American breeds. There are many more examples,but the point is,if we can breed them right and share the stock with others,we can truly preserve what we have.Learning the art of breeding is paramont and it requires a lot of thought and effort. This goes equally to the composite breeds and the old original races.