I think you're commenting on real trends (economic and political) in the ongoing post-Reaganomics/post-Thatcherism era

However, you greatly overstate your case by saying that an individual person's politics can be "revealed" "just" based on that alone, or that the difference between parties is "just" equivalent to two decades.

A road grader is a wonderful machine, just don't try using it as a scalpel. :)

https://www.journals.uchicago.edu/doi/abs/10.1086/706889

https://www.nbcnews.com/news/wbna46057552