[rtpg]

It's super nice to have timestamps as a quick way to know what program you're looking at.

Sticking it into --version output is helpful to know if, for example, the Python binary you're looking at is actually the one you just built rather than something shadowing that

[izacus]

The whole point or reproducible builds is that you don't need to rely on timestamps and similar information to know which binary you're looking at.