If you need the template but don't have an older Xcode version on hand, I posted it to dropbox. Enjoy. https://www.dropbox.com/s/tug9kokxolfacq3/AppleScript%20App.xctemplate.zip?dl=0

My guess is that they phasing out ApplescriptObj. They want to make it less accessible to the average user because Swift is the new thing. It's hard to know for sure because their documentation is so opaque.