Thanks so much for reporting these discrepancies and including all the details.

• Conditional formats should be imported from list archives, but it looks like the import code has a bug. We'll fix this (and add a test case so it continues to work) for 15.2. See https://www.labkey.org/issues/home/Developer/issues/details.view?issueId=23235
• We have not yet added support for round-tripping default values/types and field validators through export/import. The only reason is that adding these properties will require a modest amount of design, development, and testing work, and current clients have not raised this as important for their use cases. We'd be happy to discuss options over email. (Note that the existing "defaultValue" element is not used during export/import, it's currently used only during meta data overrides.)