Goat pens are rarely perfect rectangles — there's a narrow walkway along one side, a corner cut off by a support post, or a kidding pen that's a different shape from the main shed. The 2x1 ft slat is built for exactly that kind of layout. Being a smaller unit, it interlocks into tighter spaces and irregular shapes more easily than a larger panel would, without needing as much on-site cutting or custom fitting.
It's also the more practical choice if you're flooring a shed in stages rather than all at once — buying and laying smaller batches as budget or time allows — or if you expect to need occasional replacements down the line, since swapping a single 2x1 ft panel is a smaller, cheaper job than replacing a 2x2 ft section. The slotted surface itself works the same way as our 2x2 ft slat: gaps let waste drain through to the ground below, so goats stay on a dry, raised surface that's far easier on their hooves than solid flooring or bare ground.