While I won't sit here and agree that this was one of the worst launches in Apple's history, I will say I'm kind of confused as to why it's the most supply constrained.
Apple has been behind the scene's on this watch for quite sometime. The Watch was revealed in September, and it's now April. So, Apple had 8 months to get they're supply together. Everyone was waiting for it to be released in March,but that instead got pushed off until April. That being said, maybe there have been issues with making the watch. I know nothing about production, so who knows what's really going on as far as production issues. I would think though, given 8 months, and a little over a million pre-order sales reported, that there wouldn't be such a constraint on supply.
Perhaps I'm wrong here, but I will say given this is Apple's newest product in years, I would say job well done as far as exceeding customer's expectectations.
-Shawn