If anything, it wasn't the 4090 that was mis-named but the 3090, which should have been a Titan. As you say, they marketed it as a Titan replacement and even Jensen still referred to the 3080 as the top tier "gaming" card at launch. Who's to say there isn't a 4000 series Titan card coming with the "pro features" you mention?
Regards the uplift, the 4090 is nearly twice the performance of the 3090 which seems a pretty decent uplift to me, especially for only $100 more than the 3090 was at launch?
(I'm ignoring the 3090Ti here, which was just a money-grab)
Ada has no NVLINK capability on the chip, even their A series (Quadro) cards don't have them this generation and why they still sell Ampere A series for people that need NVLINK and up to 96GB VRAM with 2 x A series Ampere 48GB.
Ada was designed as a gaming chip.
Ada is not twice as fast as a 3090 and nowhere near. Don't fall for the fake frame generation rubbish. Ada is 55-60% faster at best in some games that have been Nvidia sponsored.
You are falling for the large increase in numbers because they came from a larger starting point the 3090/ti, it is almost the same increase we got from 2080ti to 3090.
Here is a video that explains it and shows you the RT advancements too (get ready for the reality)..:-
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