I'm just going to assume this is better and more cost effective than teslas. Why is tesla so adamant on making a module that mounts on the wall, on the interior

I'm just going to assume this is better and more cost effective than teslas. Why is tesla so adamant on making a module that mounts on the wall, on the interior of your house? Toyota, being pragmatic engineers, say make it a big rectangle that sits on the ground, outside, like a gen-set. A few hundred dollars of cinder blocks later and you don't have to worry about the house burning down.