The warnings I've had issues with were warnings regardless of whether the code was templates: ignored return values, unused parameters, etc. There may be cases

The warnings I've had issues with were warnings regardless of whether the code was templates: ignored return values, unused parameters, etc. There may be cases where the potential false negatives are unacceptable. Be judicious, but in my case the benefits far outweighed the risks. Of course, it's a great idea to provide upstream patches and issues whenever possible.