As someone in the comments section of the original post put it, "newer doesn't mean better". Obviously software with security, stability, or performance issues

As someone in the comments section of the original post put it, "newer doesn't mean better". Obviously software with security, stability, or performance issues should be re-written, but software doesn't "age" in the usual sense of the word; the source code can be re-compiled for brand-new machines/processors. A 2004 version of grep will always do everything I need grep to do.