Renewable power calls for massive over provisioning to minimize time where backup energy has to be used. Over provisioned energy could power hydrogen production, in which case the "inefficiency" doesn't really matter, as long as there is no other better purpose for which the energy can be spent.
There's obviously a sweet spot which may invalidate this argument. But to me it sounds like a win-win, even if only focusing on aviation.
Aviation could be interesting, but when it comes to cars the problem is not hydrogen production, it is delivery. The hydrogen could be produced for free and it would still be a bad solution.
There's obviously a sweet spot which may invalidate this argument. But to me it sounds like a win-win, even if only focusing on aviation.