This is an implementation detail, and Google Sheets and Excel differ in their implementations. The Kendo UI Spreadsheet does not try to replicate all Excel features, since the Excel codebase has accumulated features over 30 years and has millions of lines of code, which is not optimal for a web widget.
For the specific case, 1/30 is a computation, while 0.033 is a number. Users can input computations via formulas, and this can be serialized as a number from the server, therefore we do not find the lack of this extra code limiting to users or developers.
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI