Im not defending Apple cos ive been waiting almost 6 weeks for my watch...
But maybe Apple underestimated demand.. They maybe felt it wont kick off as fast as this, maybe comparing sales of galaxy watches and others which i dont think have sold as well as this? Might be wrong!!
Also Apple are using a JIT( just in time) manufacturing so for each order they are making smartwatches.. But come gen 2 and gen 3, they might produce millions so that we dont have this mess again!!
iPhones on other hand are thier bread and butter so iPhone 6+S/ 6S will go into mnaufacture by July/ August and millions produced and by September all pre orders filled and enough stock in stores too.
I think Apple just heavily underestimated this launch big time!! Started off available 24th then they changed the wording.
iPhones are normally ready to buy at stores by October walk in!!