I find this scrubbing to be too aggressive so have needed to disable it.
It is intentionally designed to be "better safe than sorry" by default for new organizations.
i.e. it seems to give you a choice of "Either use our default options, or start from a blank slate yourself", right?
Yes. There's also a third choice: "use the default options and additionally specify more fields to be scrubbed".
Or can I assume that the list on the documentation page is complete and accurate?
I believe so. You can also see what the scrubber handles in the source code.
I think one option that we might explore in the future is, instead of clobbering the entire value/key, we just strip the substring.