I see that we can create Hierarchical Drawers by using the Template: Blazor Drawer Demos - Hierarchical Drawer | Telerik UI for Blazor.

However, implementing a Hierarchical Drawer through the Template is very verbose, complicated, and takes time to setup. This slows down initial development and future maintenance. With how common hierarchical sidebar menus are, I think there is significant value in updating the Telerik Drawer component to render hierarchical sidebar menus without the need to configure the Template or add other code.

Overall, I would like the Telerik Drawer component to automatically render a hierarchical sidebar menu by only passing in hierarchical data into the Data parameter and not having to configure the Template or provide additional code. Looking at MudBlazor's Navigation Menu component, they provide support for hierarchical sidebar menus up to four levels without any extra configuration.

Generally, I would expect Templates of components to only be necessary in uncommon scenarios. I would not consider hierarchical sidebar menus uncommon.