I'm not saying that we need to change it because of realism.
I'm saying we need to change it because of game balance, and that we CAN change it WITHOUT being unrealistic (that is, we don't need to say "the fire is magical so it's LESS harmful than real fire")
I'm saying the change need to be that a samurai designed to play a specific role in a party and a shugenja designed to play the same role (whether that role be direct damage, protecting others, or what have you) should be about equal in terms of ability to actually do their job.
The build you seem to favor, meanwhile is "Shugenja are better at everything except protecting shugenja". Which is frankly a horrible vision of what the game should be like that reduce the vast majority of schools to "Whatever, we're just fighting off the mob while the shugenja does all the work".
NO the build I favor is increasing the Bushi and courtier power. If we look at the Yasuki courtier fgor example he can do something no Shugenja can and that is getting anything he needs. So thats a good example how courtier could become unique. Increasing the overall powerlvl of Bushi and
Courtier is what I want. Yes this is more work but thats also would make the game more epic and push it more in the Wuxia /Anime direction I like.