Who said there's no grace period? Python 2/3 is dealt with the same way. On 1) a rolling distribution not called NixOS 2) which mindlessly installs wget2 3) an

Who said there's no grace period? Python 2/3 is dealt with the same way. On 1) a rolling distribution not called NixOS 2) which mindlessly installs wget2 3) and does not use their own power to install or name the binaries according to their own view, sure 4) nor use a grace period and badly informs the user(s) which something like Homebrew would... then yes, it is a problem. On a distribution which has stable and LTS releases such as Fedora/Ubuntu/Debian it is no problem as long as users would read the release notes. It could be a problem on Arch and Gentoo, but whenever those users run into trouble you could argue PEBCAK or go fix it yourself. Same for those running -CURRENT on *BSD.