On the HFS+ side, you should probably not be using HFS+ anymore. Not supporting encrypted file systems is one way to reduce the maintenance cost of keeping a file system before phasing it out definitely. It’s nice they do that in phases at least.
For more or less similar reasons you are not supposed to use ext2 or ReiserFS on Linux (you can, with enough determination), and I think both of these are much newer than HFS+.
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On the HFS+ side, you should probably not be using HFS+ anymore. Not supporting encrypted file systems is one way to reduce the maintenance cost of keeping a file system before phasing it out definitely. It’s nice they do that in phases at least.
For more or less similar reasons you are not supposed to use ext2 or ReiserFS on Linux (you can, with enough determination), and I think both of these are much newer than HFS+.