A couple of years ago v5 was years away and v4->v5 wasn’t a problem. Now it is. Those who are now new users will be old users when 6.0 will be released and have forgotten the environment variables which they set couple of years ago and will come here for advice because they have problems with environment variables set by 5.0. Therefore, just don’t set them. Let the KiCad’s own automatics set them as internal variables and edit them with the KiCad UI if needed. It works perfectly (after the bugfix, for typical default installtions) and is actually easier and more simple than using system environment variables.