Currently when screen sizes get smaller and smaller the grid is squeezing the columns as much as possible. But if there are a lot of columns this will soon hit a size that couldn't be squeezed any more. So the result is scrolling which is giving a bad user experience. However often there are columns in a grid that could be omitted on smaller screens because they aren't that important.
How about adding some type of "class" to the grid column to tell Kendo that this column should only be shown on medium sized screens and up and another one should be shown on xs size and up (=always) and others should only be shown on large screens?