Not sure about 2016, but the 2012 version of Express did have a SKU that included SSRS. There are some limitations to the version. A looong time ago I wrote a utility[0] to work around some of those limitations as we had the licensed version but we were working with partners who had Express.
There are also some questions/answers on StackOverflow [1] that suggest you can mostly get by with doing SSIS stuff against the Express version as well, but you don't get all the capabilities.
What's interesting about MS too, is that depending on what you do, the production versions still aren't that much money. If you do any sort of commercial software development, MS will pretty much give you a bunch of free software (including MSSQL to a point) just to keep you on the stack and to advertise that you use their products over others. Between BizSpark and the Partnership Network, it's very reasonable.