The Communists always adapt the revolution to the history and customs of the target country. Red China is no exception.
If you are talking historically, as in the last 100 years... it was a HUGE problem...but gradually it has started to die out.
If you look at things in a snapshot of just that time frame...I can see your point.
If you step back and look at the larger picture it was a foreign idea put into China. It was experimented on for 30 years and then began to decline, which it continues today to do just that.
My point is, there is something larger than communism in China that is at the root of the problem between the PRC and Taiwan.
If though it wasn't communist, and just some other random dynasty, the conflict would remain the same.
Its deeply rooted in the culture.