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PS4 Pro Was a Test Case for PlayStation 5's Lifecycle, According to Sony
Sony's Executive VP of Hardware Engineering Masayasu Ito revealed that the PS4 Pro was a test case for the PlayStation 5's lifecycle.

As part of the 25th birthday of PlayStation, Masayasu Ito (Executive Vice President of Hardware Engineering and Operation at Sony Interactive Entertainment) might have just provided us with a hint. According to him, the PS4 Pro was basically a test case after Sony realized that the PlayStation 5 lifecycle would have to be different than that of previous generations.
Indeed, in the past, the cycle for a new platform was 7 to 10 years, but in view of the very rapid development and evolution of technology, it’s really a six to seven year platform cycle. Then we cannot fully catch up with the rapid development of the technology, therefore our thinking is that as far as a platform is concerned for the PS5, it’s a cycle of maybe six to seven years. But doing that, a platform lifecycle, we should be able to change the hardware itself and try to incorporate advancements in technology. That was the thinking behind it, and the test case of that thinking was the PS4 Pro that launched in the midway of the PS4 launch cycle.