I didn't even say that, but look at what they changed and how the changed it . Did
peak L/S bandwidth increase , No
peak ALU throughput increase , No
peak FPU throughput increase , No
peak dispatch/issue/retire , No
Peak Decode through increase , No
Number of register file ports , No
Number of FP register file ports , No
Did the floor plan change , No
Did internal structures increase massively in size ( reg ' L/S queue dispatch queue etc) , No
Did the pipeline change , No
Get the point , Zen3 in bound by the Scope of Zen1 and Zen1 was designed with a big enough fundamental base through the core that large gen on gen improvements could happen .
Now compare that list with Willow to Golden or Tremont to Gracemont.
Im saying i think Zen4 wont be bound by the Scope of Zen3. In the same way that Zen wasn't bound by bulldozer yet lots of things came straight from it ( like the FPU still supporting XOP). So i expect fundamental changes in featch/decode , execution and retirement / memory access for Zen 4.
To go to your metaphor go stick a 560HP 6L engine from an enzo in a Golf GTi and see how well it works, there both cars, they both have 4 wheels.