Very generally, badly. It is pretty inconceivable for a game to be in planned development for 8 years – partly for the reason you mentioned, the technology keeps improving and there is no visibility that far in the future.
A designer might have a game concept stored in their mind or some file for years waiting for hardware/software to mature to where it can be realized but actual development more than 3-4 years is very unusual.
It is nearly a certainty that anything with an 8 year development timeframe ran into very very very serious problems.
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