Maintaining a big, binary blob will make the git history grow in proportion to the size of the binary blob, not the size of the logical/abstract diff, regardles

Maintaining a big, binary blob will make the git history grow in proportion to the size of the binary blob, not the size of the logical/abstract diff, regardless of how comprehensible the diff looks. To minimize the disk space to only the changes, you want to store the changes and not the complete, binary before/after images. By filtering, you reduce the stored object to the difference.