That's crazy spend for anyone making sub 100K
A developer using even the clunkiest IDE (Visual Studio - I'm still a fan and daily user, it's just the "least efficient") can get away without a dedicated graphics card, and only 32GB of ram.
Honestly a huge chunk of it is the Apple internal SSD tax but who wants to wait for usb3 external i/o?
you're just building a gaming rig with a flimsy work-related justification.