OpenZFS on OS X

I'm about to have a fresh go at using OpenZFS as my main data store on my classic Mac Pro. It will house an iTunes library at least, maybe a Photos library... So it seems I should be setting mimic_hfs to on.

My question is: Are there any disadvantages to doing so? Or stated another way: Why not just do that for all datasets as default?

When you ask a filesystem for its name, it should return "zfs" or "hfs" correctly, so that properly written software can use it (as a guide). That we let you override it to say "hfs" because a few applications are doing stupid things is one thing, and a whole other to set it to be default and always "lying"

Understood, in principle it is simply incorrect.

So I could ask the converse then: Are you aware of any software that will function incorrectly because it doesn’t know that the filesystem is ZFS?