Electric or belt driven fans

While my Cat engine is being rebuilt I decided to rebuild everything on the front of my 379. Anyone that understands engines knows that anything driven by a belt is robbing horsepower from the engine. Does the torque on a diesel make the difference? Why haven't any of the manufacturers gone with electric? Not looking for rocket science answers, just general thought about the subject. Seems if you completely sealed the back and used two rows of electric fans that they would be able to adequately cool the engine allowing less horsepower drain on the engine. Of course you'd still need belts or serp belt to drive the alternator and such. I'm eliminating the ac system and going to a self contained roof top unit. I don't layover so I think this is a smart way to go / eliminating a system that fails year after year.
So what have you guys seen in the past and/ or do you think this is a viable option?

 

That's what I'm wanting to know. Appreciate your input. Safe travels.

 

That's a good point. Also the bank of fans would some what restrict the flow of air through the radiator coils. I'm doing away with the ac condenser. That'll improve flow too. Thanks for hittin me up. Safe travels.