I've not got a dog in this fight and I can see all sides, however as I don't own an 8Y I think you can guess my conclusion.
I bought a new Ford as a stop-gap between BMWs and 6 years later I still had it. For what it cost it was well put together, never cost me a penny over normal maintenance for 60K miles. To this day it is one of the best balanced and fun cars to chuck around the place I have driven.
In many opinions the interior of the 8V RS3 is not spectacular for a 50k car, but I'm not a fan of overly fancy interiors and for me the 8V interior is well put together and does not let a 50K car down, even though it is basically the same as a base A3 TDi.
The problem I have is an 8V that was 50K is now over 70K for an 8Y, that is a big jump in a couple of years even taking into account the price of cars. For me that is starting to knock on the door of cars that are a step up on any A3 variant.
It is all about perceived quality and what you get for the money.
If I did not have the 8V I would not be buying an 8Y because for the money it just does not float my boat and I'd likely either be throwing more money at it to get something that felt more worth it to me or I would be buying another stop-gap, maybe even another Ford.