Why should they? It was a good riddance. Given the timeframe Raja was hired by AMD, maybe Fiji but surely both Polaris and Vega, the worst GPUs AMD developed since before the Terascale days, are his brainchildren. I have this theory he's an Nvidia undercover agent, since they are the ones who benefited the most from Raja's tenure over RTG.
Of course, to the company who developed Larrabee and Iris Graphics, Vega must look like a shining standard, so yeah.