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And what is the downside of 3♦? That the opponents can compete more easily? In diamonds perhaps, but I am hardly worried about them bidding 4♦. That it will tell them what to lead? They are by far most likely to lead a diamond anyway. I don't have a serious qualm with the enterprising 4♥ bid, but really if partner rejects an invitation I think it's a lot more likely game is bad than good.
The downside for me is that my LHO can either double, or not double (depending on their agreements) to dissuade my RHO from leading diamonds; and may lead a spade. A direct 4♥ mitigates this risk.