OP,
That is pretty good, I think you are taking away the right stuff. . But the table and arm are really important. I just had my Linn LP12 sub chassis replaced… it was a fabricated metal plate that was replaced with a solid piece of metal with different diameter holes drilled in it (the Keel) to dampen vibrations… had a surprising large effect.
So, it all matters. I fiddled with sub $2K turntables for a couple decades. They sounded ok. Then I got my first audiophile table the VPI Aries… and a ridiculously expensive cartridge.. the Van den Hull Frog ($2.5K?). I just dropped my jaw… the table just completely got rid of surface noise.. it just disappeared.. pops and clicks disappeared into the background. The cartridge just picked up levels of detail I could not imagine was possible.
Today, I own a Linn LP12 with a Koetsu Rosewood Signature cartridge (~5K). I put a Silent Running Audio Isolation platform under it ~(3K). I also upgraded my tone arm to Line’s top of the line toe arm (~5K)… wow… greater solidity and detail.
But you are definitely correct… without a fantastic phono stage, you are not going to hear it. Without my Audio Research Reference 3 Phonostage… I would not hear all the incredible improvements in my TT.