No matter how difficult the problems are - it still costs billions of dollars to develop a rocket program, and disposable rocket programs have the "advantage" for the industry of a steady order supply... which means the industry has no incentive to push for reusable rockets.

SpaceX has the advantage of being funded by a billionaire who isn't beholden to any political demands (including job creation/upkeep), and so they can do whatever promises the biggest profit.