As Azure Stack is designed to be a hybrid cloud solution there is in general the need to have services that will be integrated from public Azure, like the Marketplace syndication feature. As this is, more or less, one of the most important feature to have less TCO than with another solution, for that you would have to create your own templates. It's more or less a reuse-option that will save time and money.
With the next chapter we will talk about function apps or so called Code as a Service and discuss some ideas that may come in future updates of Azure Stack as they are on UserVoice and already have a high rating because a lot of customer really looking for it.