I know they must be here somewhere, but where do I find release notes for intel fortran versions to see if there is any reason we care about to update from version 17.1?
It used to be https://software.intel.com/en-us/articles/intel-composer-release-notes-by-version , but the list from that page hasn't been updated since the original release. https://software.intel.com/en-us/articles/intel-parallel-studio-xe-release-notes-and-new-features is a new page with updates. You can also click the Release Notes link from the download page at registrationcenter.intel.com
Don't bother looking for lists of bugs fixed.
For more complete information about compiler optimizations, see our Optimization Notice.