Makes sense when you only play Switch games but have you not seen games on other platforms?
I have seen games on other platforms, and perhaps I should have elaborated more - to me whatever tricks they used for those low poly landscapes made up for an incredible, impressionistic effect. Sure, it is not as realistic as say Horizon or RDR2 (which also have HDR), but the effect really invites sense of wonder I have not seen in anything else before. I do admit I respond better to stylised than mimicking real world.
Would you care to suggest titles that come close in achieving the what BotW does?