If I'm buying a new product, I want to see a lineup of exactly the products a given company thinks are competitive, ordered by price or performance. I don't want to have to pore over review articles and youtube videos to figure out how many performance grades correspond to how many generational jumps and cross reference to older generations. I just don't.
If they named things properly and wouldn't mix generations within a single generational series marketing campaign (5xxx series), you wouldn't have to - as a consumer, if you wanted to buy the best, you would buy the 5000 series. They would still carry 4xxx stock - if you wanted something at a different price point, you'd buy the 4xxx series.
AMD's choice to mix generations within the same series makes things more confusing, not less confusing.
Do the two different generations have different TDP envelopes? I though the 5xxx and 4xxx series both use Vega - what is the appreciable product difference between Zen 2 and Zen 3 if the performance/TDP/graphics performance is the same?
the point is that it's annoying to compare 4000 series parts against 5000 series parts to figure out what is the best budget AMD CPU. outside of enthusiast circles, no one cares about being on the latest architecture. they care about what is currently the best performing part within their budget.