Like the rest of the NBA, Miami Heat head coach Erik Spoelstra went 470 days without seeing Ben Simmons play basketball before Simmons made his Nets debut against the Philadelphia 76ers on Monday. And like many of Simmons’ past opponents, Spoelstra knows just how difficult a matchup the Nets’ new point guard has been. Speaking to reporters ahead of Thursday’s matchup between the Nets and Heat, Miami’s coach detailed exactly why Simmons is one of the most difficult players to check in all of basketball. “He is a tough guy to game plan for because so much of what he does is in the open court or …