For the last time just because something is less complex does not mean it's inferior
The definition of complex is composed of many interconnected parts; compound; composite: characterized by a very complicated or involved arrangement of parts, units
Look at schemes like the bear defense or the wildcat offense
When these schemes came out they were hard to defend or play offense against because had not been seen before thereby adding another part of gameplaning ( see the definition of complex)
The game add new innovations and wrinkles every year..coaches spend time and figure how to combat these schemes. Eventually this gameplaning stops teams from overlying on these schemes but the concepts still remain in the collective Football playbook making the game more complex by the year.
It's not a hard concept to understand .