Why all filesystems use 1024 offset

[Kubuxu]

While researching existing filesystems I noticed that all of them use 1024byte offset for their superblock. It makes some sense, this way you can't override MBR and GPT but only GPT on 512byte logical sector disks. In case of 4k sector disks GPT will be at 2nd sector which is 4096.

This convention (1024bytes offset) is not documented anywhere (at least where I could find it). I will hold it, but I would love to know why.