Sadly even back in my day (and from a fairly decent uni in Australia) the (imo) classics like os, pl, graphics courses were neither mandatory nor "comprehensive" (ie they focussed on theory and large exams at the end instead a full featured project).
Even worse for Ghanaian Universities where I come from, You could boldly say 99% of CS/CE students never get to implement an operating system or programming language even though they spend 4 years doing CS/CE and you would be right.