The temperature indication is of great value to operating crew not only to confirm normal operation, but also as a secondary indication of an abnormality, so it's useful to know what will generally happen in a particular type.
Sounds like the Bell situation is to read hot with oil loss or very low pressure, whereas the S92 didn't apparently. No doubt there would be other secondary indicators like warning captions etc, but I guess it's good to know what your type can be expected to do in a given emergency (although as we all know, Murphy's law can be relied upon too, so it might not always go that way).