Is it possible to set a certain size for a blobstore or a repository?

But I just don’t get it. Within the “soft quota” there is an option to warn the user that there is x amount of space left, but if you can’t set a default size for a blob, what is this option for?

For example, if I have a capacity of 600 GB and I have 3 blobs, each one has a capacity of 600 GB, given that they take the maximum, but at most they should have 200, so I don’t understand why you can’t set a limit or know the size of a blob after its creation, given that the blobs I have all have the same free space.