Wait, you don’t develop coordination picking up tiny bugs, jumping rock to rock, climbing trees or moving over uneven terrain? The irony is particularly deep here because I’ve come to appreciate how much more agile I am as an adult due to my outdoorsy upbringing in a mountainous area.
You don’t develop valuable social skills asking adults about things you want to learn more about? Learning how and when to ask questions is extremely valuable. And that’s not to say you can’t play plenty of social games in a woods –– many that don’t work on grass, tag is way more fun, any sort of fantasy/imagination type game is much more vivid, hide and seek is actually a fun game.