why is the run and shoot dead?

I'm asking for something deeper than “defenses figured it out"
How have they figured it out? I've got a decent understanding of x's and o's but not enough to grasp the schematics without it being explained to me. I understand the concept: run where they aren't based on coverage.. On the surface It seems like that would always work.
Obviously the r&s revolutionized the passing game and it's basic principles still exists so it's alive in that sense, but schematically speaking, why is it extinct? Or was it just jones unwillingness to change with the times? Maybe if he dumbed the reads down like he did in 09 with padron, utilized a te, a scat back/fb combo, recruited better players, and understood the value of a dual threat qb, thisoffense could still exists in it's principles even if it didn't look the same formation wise
If anyone with greater football knowledge than myself has an answer, I'd be genuinely interested in hearing it
How have they figured it out? I've got a decent understanding of x's and o's but not enough to grasp the schematics without it being explained to me. I understand the concept: run where they aren't based on coverage.. On the surface It seems like that would always work.
Obviously the r&s revolutionized the passing game and it's basic principles still exists so it's alive in that sense, but schematically speaking, why is it extinct? Or was it just jones unwillingness to change with the times? Maybe if he dumbed the reads down like he did in 09 with padron, utilized a te, a scat back/fb combo, recruited better players, and understood the value of a dual threat qb, thisoffense could still exists in it's principles even if it didn't look the same formation wise
If anyone with greater football knowledge than myself has an answer, I'd be genuinely interested in hearing it