I see that the

BATCH

message has the following note:

The BATCH message functionality is currently in preview and is subject to change. You can open an issue or join the discussion on GitHub to provide feedback during the preview period.

However, it looks like it has been in preview for about 2 years. Is it safe to assume there won't be significant changes?

Yeah, the only major change I can foresee happening at some point is replacing the use of PyFilesystem for fsspec, but that's only an implementation detail.