The reason for this ... as their main schooling language.

I think the same thing has been a problem in Finland too with the Saami language (in northern Finland) that has been spoken as long as Finnish as both languages descend from the same proto-language but unfortunately there were more Finnish speakers than Saami speakers so I think there never was a proper education in Saami as there were just Finnish or Swedish speaking schools. So if one didn't speak Finnish well, learning must have been really difficult.

Long story short, in South Africa language is very political, but things are changing, I think, or hope.

I hope so too. Too many people don't see how different languages and different people are the richness of life, not something that just needs to changed so that everyone are or speak the same.

For example, people in South Africa easily boast about our 11 official languages, but if you look at the practical implementation

Uh, I so recognize this here too. People who seem to be so proud of certain things do not necessarily support that in real life. But lets hope things get better, if not in any other way than old conservative decision makers dying to old age and younger and wiser people take their places. So I'm virtually rising my glass here now and stating: "Here's to dying!"