The issue isn’t just a simple oversight. Git includes the file name as part of the tree and commit hash. The hash has security implications. There’s really no way to make the hash support case insensitivity without opening up a multitude of holes there. So there will always be a mismatch, and you can’t just fix it without changing how git works from the ground up.
Well there’s no shortage of those, and they’re unusually cheaper too (unless they’re specced out). I prefer a thin silent one myself, so I welcome this innovation.