I made a repl to show the issue: https://blazorrepl.telerik.com/GcaGvdaw31AartTh17

The 3 differently sized text area's render with almost the same size. Inspecting the elements, the textarea is wrapped in a span which is given a k-input-[sm/md/lg] class, and the text area is given minorly different padding for each. This works fine for TextBox, but not what you would expect from textarea.

I would expect textarea to render 1 line for sm, 2 lines for md, and 4 lines for lg, or something similar. The padding is a fairly useless difference here for a text area.