I think both of you are being a bit unfair to Raja. He became the chief architect at the renamed RTG in 2015 and left in 2017. GPU architectures take years to plan, design and manufacture and it's very likely that he had little implication on the design of Vega as a result of that. Navi is probably his creation or, at least, the one he had more saying about.
When it comes to his work at Intel, he didn't have to start from scratch, but he had to grow their graphics division a lot, and that takes time. Plus, the latest rumors said that the problems that are delaying the launch of their cards weren't in the hardware itself, but the drivers team.
Please excuse my bad English.
Former gaming PC: i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Current gaming PC: R5-7600, 32GB RAM 6000MT/s (CL30) and a RX 9060XT 16GB
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