This hasn't been a very smooth launch, no doubt about it. Apple should have delayed the launch until they were able to produce more pencils and keyboards.
This is essentially a soft launch like the iPad Air and iPad mini 2 in 2013. Remember supplies were constrained, as well. I do think it was odd that there were so few Pencils and Keyboards ready given how much they were hyped. But lots of people aren't going to want either or both, so I don't fault Apple for putting the iPad Pros out before they have enough Pencils and Smart Keyboards. That said, they should have managed expectations better, perhaps even announcing a later launch date for the accessories.
The iPhone 6s launch was very smooth. That's Apple's top selling product.totally not cool with it. Apple launch has been ****** since the Apple Watch