It will be easy for the Philadelphia 76ers to convince themselves a new coach will solve what ailed them this season. The injury to Ben Simmons is a convenient excuse for the front office’s roster construction failures, and incumbent coach Brett Brown all but fell on his sword following the team’s first-round playoff exit at the feet of a Boston Celtics sweep, acknowledging his inability to maximize a misfit rotation. A new hire may buy general manager Elton Brand another year on the job, with the promise of a few tweaks on the fringes.