I would say it's not at all wrong to miss your EVA. I came from an EVA background myself, so I completely understand.
With regard to your questions:
1) I would say if you're OK with the settings, there's no need for a separate CPG. One thing that took me a bit to fully get is that a CPG is not equal to a Disk Group in EVA parlance. You can create as many or as few CPG's as you like, and the physical disks can be in multiple CPG's without issue. Generally, HP's best practice is to minimize the number of CPG's as much as possible, as it makes the administrator's life easier, and the array simpler. On my arrays, I have 4 CPG's, 1 each on FC R5 and NL R6 for AO, and 1 each on FC R5 and NLR6 for no AO.
2) as far as snapshots are concerned, it doesn't necessarily constitute a separate CPG, but it is a separate type of space allocation. your VV will reside in the "user space". For snapshots, that is "copy space". So if you don't assign a CPG for copy space, you cannot take snapshots or replicate the VV. Note though that the CPG for copy space can certainly be the same CPG as the user space
3) There should be no need to change the availability parameters to go from 3 to 5. HA Cage should still be just fine.
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