I don’t know how well 4K will go over with the general public, but Sony decided to diversify in both pseudo-4K and VR with the PS4 Pro. Sony’s approach is basically that if 4K doesn’t take off it can always fall back on VR, and if VR doesn’t take off it can always fall back on 4K. If neither take off? Well, then it’s screwed. However, Microsoft is hedging bets on the 4K route, hence the focus on putting so much power under the hood.