I would agree with you if we had a higher HP cap in this server,
but we don't.
The reality is, this server runs on a HR damage, with LR hp and SP caps. That is why we Do need berries to Pvp well. All the more if Berries were not allowed in a Non item usable Pvp, Sinx's Will own all the more, seeing that a normal sinx CAN do an average of 9~10k damage (im saying at the very least) or even 32k from vets. How are you suppose to imply strategy to that?
And following on about Champions. Sure they'll be wary of Asura-ing. But they Do have TSS that can, and will hit up to 7~8k per spirit. Adding up to a total of 40k per TSS. Without Berries, 3~4 tss will be enough to kill.
I would say a Non item pvp room would be nice, in terms of seeing skills, but just not in this server.