Pharo devs are not inventing new stuff, they're reimplementing existing stuff, poorly, in their favorite language because said language is incapable of interfacing with the existing mature tools.

Whoever designed the GUI also probably never used even git, or they couldn't stand their own tool. From the top of my head: 1) it shows all commits in a linear list (with broken unicode) completely ignoring branches 2) deletions are green and additions red.