Allow me to backtrack… I was getting the new --watch-fs feature confused with --continuous (see continuous build). Please disregard my previous response.
I’ve always used clean workspaces on CI agents (rather than dirty/incremental workspace) so I’m not sure that --watch-fs would be useful to me in a CI scenario. I’m guessing it might be useful when you only have one or two CI agents (so you’ll often get the same agent(s) for the same build), again this is not how my CI agents work.