The loader should not be hidden by default if hideLoading() is not called. I tried a very simple scenario in the following Dojo and could not reproduce such a problem:
Could you show me a sample where the issue can be reproduced?
Have in mind that in some scenarios it is possible that a call to hideLoading() in the internal Kendo UI code may be hiding the loader that you showed. For example, on successful binding of a ListView, hideLoading() is called internally.