I think there is a trend for a set of tools which auto-generate stuff. It started back with web tools generating websites from WYSIWYG, now it is getting everywhere.

We build services and models using https://www.protoforce.io, which also auto-generates client and server side. Generally, it is impossible to generate good code using templates only, so it has to be transpiled.

I think from amazon's side it was coming sooner or later anyway, with the amount of APIs they have - it is inevitable. I just can't see how many teams you need to have to manage all of the client side code for many languages.