Most of those git binaries are links to git for tab completion in your shell.

DVI is exactly what we're talking about: a strange custom format that only exists to be transformed into formats we want. A modern TeX should produce PDF output with no DVI intermediate stage.

Same story with Metafont. Outside math, people want good fonts developed by typographers. Those fonts don't show up in Metafont or TFM format, they show up in OTF and TTF. Getting TeX to handle these is quite a chore, but even if you do, you're still going to have Metafont and all the strange intermediate files it creates lying around on your filesystem.

There is a reason no other software is built like TeX: it's terrible. But for its history and the fact it does the job really well, nobody would tolerate this mess.