You are probably forgetting about dependency hell, reproducible builds and automated testing. Waaaay tooo often some software won't compile because a bad versio

You are probably forgetting about dependency hell, reproducible builds and automated testing. Waaaay tooo often some software won't compile because a bad version of the library is installed in the system or an incompatible compiler is used. Or two perl/python apps require different dependency version. All those problems are quickly solved by Docker. There were no better way to solve it, other than packing and versioning everything like in Chrome build process...