Understood. As mentioned, we will consider a way to do it without the extra steps. The workaround described above is a stopgap until then. While I also wouldn't suggest asking animators to write terminal commands, it may be acceptable for them to run a shell script that does the necessary steps for them.
However, I do believe that automating export can be beneficial in many cases. In general, it can be error prone to trust people (animators, programmers, or anyone else) to both remember to do the exports when project files change and to do all the exports with the right settings, to the right place, etc. Also, often a build is not just processing Spine projects
usually all but the simplest of applications has a fair amount of tasks that can be automated to reduce errors and save time.