Because these to widgets are for webdevelopment and are one of the oldest widgets in the Mendix toolbox.
At this moment the Datagrid has a precedor Datagrid 2, which servers the needs of 2022 far better.
Secondly: Native = Mobile = Smaller view port.
Besides the fact they are not compatible; having a grid view on your mobile view port …. I’m not a UX expert, but I would not even consider using them. As its bad UX
Solution: use the listview icw layout grid to create columns. A header can be created by adding a layout gri with the same distribution above the listview and style it a header.
Note: doing above; you might end-up with a challenging UX