Scipion, I do agree with your points. Valid. But metagaming (that is the right term, correct? Sorry, English isn’t my first language).
Also, when do you get to use Nature? Nature is just for escaping, climbing, hiding, and foraging. How many times do you do that PER SESSION? Once maybe, twice if you’re lucky. So even for a Nature 5 mouse, that means 5 successes and 4 failures, THAT means a minimum of using Nature 9 times. Assuming they use Nature twice per game, at a game a week, that’s a month before you get to level up Nature.
How do you recover Nature? By giving a prologue or by being absent from a game or by a winter session. So unless you’re the only player, you can recover one point of Nature at MOST every other week! I’ll make you guess how many times you come across a winter session during a game campaign, so while that is an option, it is too small to be considered.
What does all this mean? Sure, it’s easy to tap Nature but remember, if you are going against it, you lose at least 1 point for Tax. Lose by a MoS of 1 and your Nature 6 is now Nature 5/6, lose by MoS of 2 and you’re at Nature 4/6! Subsequent use of Tapping Nature uses the current Nature value, not the max value, so unless you knock off one point every now and again, tapping Nature yeilds you less and less. Sure, it’s easy to knock off one point of Nature to get it all back, but see my points above regarding levelling Nature back up.
While having a Nature at 1 means it’s easy to learn new skills, you have to make sure you don’t use your Nature. Nature 0 means you get a trait changed, and you may have to retire your character until next spring (and only the GM knows when that will happen!). IMHO, a very fair mechanic and makes sure to reign in abuse.
Now, from a player’s perspective, how many times would you want to have your Nature to help you out? At least once per game, I would assume, and not all of that would be acting WITH your Nature! So again, you risk losing your Nature every time you use it!
You will find that Nature is very handy and very easy to use, but very hard to recover — that means it is very valuable! It isn’t like D&D’s Action Points that gets recovered every session!
Hope that helps you appreciate Nature!