Featured Image Size Limitation

Hi, I′m curious why you′ve limited featured image thumbnail sizing to one aspect ratio. I am not able to add a portrait image, without It′s being cropped, or deformed. Also the image gets pixelated. I liked to use your theme, but this limitation is a huge bummer, and shouldnt exist in the first place. Astra, Kadence, Blocksy let′s you choose which size and aspect ratio you′ll want to use. Is that so hard to implement in Neve?