The trees have an insane draw distance for an open world game on Switch level hardware. I'm not even sure if they're using LoDs. At that distance they should be replaced with billboards/sprites.
The cliffs are too large for a single texture. Without small-scale detail, it looks blurry up close. Without large-scale detail, it turns into a solid ugly block of color at a distance. Adding a separate detail texture would allow you to have both.
But most importantly, there's something completely fucked about the terrain's lighting. Look carefully at the way at the light hits the ground and try guessing where you think the sun is. Then do the same for the characters and trees. They're being lit from two completely different directions. The cliffs are in shadow when they should be directly in the sun's path.
Game Freak are using "naive" solutions when creating a sandbox game instead of looking to what other developers have said in SIGGRAPH and GDC and dev diaries over the past 15 years. A lot has changed since Oblivion and Just Cause 1 and not just computing power.
