Some eagerness and other flags might in fact be required for other flags. For example, eager rmdir and eager unlink have a prerequisite on inaccuratestat and cachemissing being turned on. Otherwise, getattr will return the true stat information for the backing filesystem. Since libfuse itself will do a getattr immediately following delete, this is disastrous (the existence of the file is then cached by libfuse, causing e.g. future new create operations on the same name to fail).
Some eagerness and other flags might in fact be required for other flags. For example, eager rmdir and eager unlink have a prerequisite on inaccuratestat and cachemissing being turned on. Otherwise, getattr will return the true stat information for the backing filesystem. Since libfuse itself will do a getattr immediately following delete, this is disastrous (the existence of the file is then cached by libfuse, causing e.g. future new create operations on the same name to fail).