Go ahead. Compile the evidence you think you have. I think you'll find the notion that the PS line has always been as powerful graphically as the most powerful PC's available at launch to be a ridiculous one, let alone using that as justification that the next one will be too as a result. The PS3 shipped with a year old, midrange GeForce 7-series when the GeForce 8 series was hitting store shelves at the same time. The XBox 360, with its better standalone GPU that launched a year earlier, also wasn't top of the line when it came out.
Consoles aren't designed to be the best of the best when they hit the market. They are designed to be long-legged development platforms developers can feel comfortable working with for long periods of time.
Upgradable hardware and aftermarket peripherals aren't even remotely the same thing.
Prove what? That Sony has never cut hardware to lower development costs? It was common knowledge that the PS3 originally had 512MB of system RAM, and some of the early dev kits even had it. Sony chopped it down to 256 at the last minute. The original PS3 show models had twin HDMI, twin ethernet and more USB ports than even the CECHA model. Where did those go?
And where are all those features that the PS3 launched with? BC? Card readers? SACD support? Other OS? Are you telling me that Sony chopped those out for giggles rather than to lower the price of manufacture?
And you're still going to claim that in order to keep costs down, Sony won't cut some things in the system's development if it deems that they are expendable?
Future Sony hardware power is at least tangentially related to the future of the GT franchise (though in all honesty this is all completely off-topic and I expect a moderator to move it).
Future Sony hardware reliability is not, and you are overstating your case anyway.
And for something else:
Him giving you detailed explanations of why you're wrong and extreme examples to make a point and you not understanding them does not make him a troll, so stop giving him the 3rd Degree.