For me security is not the only thing that make reproducible builds interesting. I'm often interested to link a binary to its source in retrospect. This is at a

For me security is not the only thing that make reproducible builds interesting. I'm often interested to link a binary to its source in retrospect. This is at a time when the vendor might long be gone. It helps a lot to be reasonably sure that the source you analyze is the one that was used to build the binary and you don't waste time studying the wrong source. The counterargument is, of course, that if you are serious you should look at the binary anyway and never trust the source, and I can't argue with that, except - for better or worse - that this is not the world I live in. For me an as short as possible time to answer a question about a software with as much confidence as possible is key. I'm alway grateful when I can reproduce the build with reasonable effort and then look at the source instead of the binary. Regardless how much I love to tinker with binaries, looking at the source is usually just faster.