The important distinction for me is that the tools for working with partitions exist on openBSD (eg fdisk) but those deal with mbr/ gpt partitions, and won’t te

The important distinction for me is that the tools for working with partitions exist on openBSD (eg fdisk) but those deal with mbr/ gpt partitions, and won’t tell you about slices. So practically it’s a distinction you need to understand if you intend on working with them.