Personally, I think this is probably a bad idea.
It's practically an invitation for new users to create a few sock-puppet accounts in order to boost their reputation and gain access to other site features. And if they have even a basic knowledge of how to use a VPN that would be very hard to detect and/or prove.
Moreover, I suspect that the change would encourage "revenge downvoting". If someone is upset or angry about a comment on, or criticism of, their question they can simply search for questions / answers by the commenter and downvote them. Having been a mod on another site, I know this already happens. At the moment it's relatively rare, but if those restrictions were removed I think it's almost inevitable to become a lot more common.
Even good questions and answers on Arduino:SE don't attract that many votes, so it wouldn't take too much to devalue the score of those questions / answers.
I'd also ask whether SE will help rollback any damage caused during the trial period if/when the trial is deemed to have been unsuccessful? Or is that something that Arduino:SE would just have to live with going forward.