A much simpler explanation of the phenomenon is that a lion share of digital electronics made in the union was a direct copypaste down to documentation, and UI

Russian language based domestic computing industry existed, but it has stopped developing in early seventies, and by eighties was behind hopelessly, despite being quite well adapted in civilian use.

Funnily, it was the union's military that was the biggest user of hardware, and software derived from Western products, while civilians were left to use obsolete stuff from sixties, and seventies. Even mechanical computers were still around by the time of union's collapse.