Disadvantages of GPT?

There are many good articles on the net which describe the advantages of GPT
over MBR, but none of that I've read describe its disadvantages well.

What I've known about the disadvantages of GPT are those when using GPT.
i.e. not the GPT itself. e.g.:

- Compatibility with older utility softwares. e.g. boot managers, partition
managers, etc.

- There's still lack of recovery software which is specialized in GPT
structure recovery.

The only disadvantage of the GPT itself that I know for sure is that the
overhead of GPT is larger than MBR. Mainly due to the fact that it uses
64-bit values.

The other probable disadvantages is that the GPT partition type GUIDs may
not cover all of the know MBR partition types. e.g. Novell Netware (when the
GPT has a protective MBR to boot into that OS) - whether the GPT partition
type actually matters or not.

So, is there any other disadvantages of the GPT itself? e.g. minimum
partition size would be larger than MBR's. Or, the partition alignment of
GPT would be larger than MBR. etc.