In my application I am using the following.
Dojo example: https://dojo.telerik.com/@iankodj/aKIyEwUv
The spreadsheet component works well with the namespace, however any dialogs that the component opens do not function correctly.
For example, I am using Edge browser. If I copy a cell and they try and past the value via the context menu, a dialog appears telling me to use the keyboard.
The "ok" button of the dialog does not work. Looking at the html source that is added to the DOM, it appears that the button is trying to bind to the click event via a "data-bind" attribute rather than a "data-kendo-bind" attribute as specified via the namespace.
The attached file show the behavior with the Basic demo example having the kendo namespace set.