I don't even think it's that complected.I still think the key is consistency vs scope.
Casters get "scope"....ability to do things that martials can only dream of. This is the "utility" concept many discuss.
Martials get consistency. While there effects are weaker....they simply work. No saving throws no risks....if I want X to happen, by gum X will happen.
I feel that is the way to give casters their "magic" while allowing Martials the equivalent feeling of power with various abilities.
Just print the new classes and optional rules.
The WHOLE problem is that WOTC only officially supports one style with officials rules and expects tables and DMs to write complex systems themselves despite them saying they would originally support multiple game styles.
So until someone writes a 3rd party book for each genre that goes viral...