I don't think it is that unrealistic (not every combination, but popular ones). The results from parts of Europe that have many political parties, eg. Germany, show voters being relatively fluid over just a few years [1]. The US, on the other hand, has been consistently split in roughly two for ages. The combination of right on social/left on economics may be somewhat strange in the US now (and perhaps the west in general?), but in China it's the norm.

[1] https://www.economist.com/the-economist-explains/2016/03/15/...