I'm definitely with you on this one woollyshepherd.
However, in defense of those who creep feed, most of what is written out there applies to commercial flocks, so it can be difficult for new keepers to know whether or not it is essential, and breeders want to do right by their lambs. It's a bit like dosing for watery mouth - you see it on Lambing live, you are taught it on lambing courses, but of course on a small scale, with good hygiene, all those 'just in case' antibiotics are simply unneccessary - and of course can lead to problems down the line.
So thank you for raising this so people can see that it's not necessary. Another point is that if you really do need to feed your lambs creep feed, then you should either have fewer animals on your acreage, lamb later or have a different breed.
I agree too with VSS - I have seen some horribly fat sheep, especially the 'just pets' variety.
Sheep really do know how to live and how much to eat - where they have enough pasture of the right kind they can regulate their intake of herbs and browsing as well as of grass.