Deployment got harder as their platform shifted beneath us, and one day recently our entire site was replaced by a simple message that said, "We no longer support Go 1.9." That was a fun day!
@snap_as was also the first product we launched separately from @write_as, and it was built on the assumption that an entirely separate codebase would be best.
The idea was that the applications would share common components (https://github.com/writeas/web-core), but would have separate application codebases and storage.
So, starting with @submit_as, we built the functionality into the Write.as codebase. There was still plenty of copy-paste involved, but we were able to launch this new product much more quickly.
Now instead of creating separate apps first, we're building them into Write.as first and then separating out functionality over time.