[Brian_K_White]

It's not just omz, as the article itself also says, omz is just an example and actually one of the less extreme ones.

Similar assumptions and liberties are more and more common, changing all manner of system-wide default behavior not just a user's own configs, sometimes even in direct conflict with other software that wants to make is own system-wide config such that you nominally couldn't have both things at the same time. Whichever you installed 2nd would work and break the other. While in reality neither one actually needed to make such assumptions or break anything else, could coexist fine, it was just grossly and inexcusably inconsiderate installers and directions.