I feel like Nintendo not using DLSS is just one of those weird things they do, like how they didn't use anti-aliasing on Switch 1 despite the system being more than capable of a wide range of AA methods. (And plenty of other devs on the system using it)
Maybe they just don't like the artefacts it can cause, or maybe they just prefer to put the extra cycles it would cost towards other things.
I'm playing through DK Bananza now, and honestly, it looks quite clean and nice anyway at a native 1200p-1080p with SMAA, definitely much better image quality than their Switch 1 games which were typically 720p-1080p with no AA.







