Great question, lots of reasons for this build besides being the only one ever built.
Much lower center of gravity chassis than the $500+ plastic 1/8 toy. We bash/race in freezing to sub zero Fahrenheit and know the weak composite will fail along with the cheap non-adjustable shock assemblies they include on the 4S RTR.
I now have (6) total Arrma 6S rigs so components are all universal and this was mainly a spare parts build. I know the drivetrain will easily hold up to 6S bashing with heavy MT tires where the plastic CVD/Axles would be a huge failure mode for my type of land-on throttle jumping. The “center diff module” assembly is not $100 for screws to just back out of cheap pot metal.
(2) 420mm wheelbases
(2) 330mm wheelbases
(1) 402mm On-Road v2 Infraction
This used a 378mm EXB Talion balanced layout and was intended to be a great happy medium short course truck.
Not to mention a better balanced cross weight layout compared to a rear biased center diff module, more suspension articulation(just look at the ease of 150mm tire fitment without even trimming the body).
This would straight up embarrass a 4S RTR Mojave in anything but making rattling noises. Anyone is more than welcome to hop on my track and continuously traction roll their top heavy plastic pile around

, anytime.
Edit- This hobby is about having fun!
If you want to make it competitive, get rid of the coffeehouse BS behind your parent’s keyboard