That's not how it works, unfortunately. Skills you use stay fresh, skills you don't practice get rusty and fade away. You might need things you aren't using anymore.

If you never walk, your legs get weak, you gain weight, your aerobic system loses capacity, and you lose the ability to walk. You don't need it, you say, because you have your car and your mobility scooter and you'll always have these things. Your crutches don't make you weaker, you can still do everything the walkers can do, you say.

Good luck with the nature hike!

Half-agree. "Skills you need, don't atrophy" assumes you know which skills you need. You usually don't, until something happens and the skill that would've caught it is the one you stopped maintaining.

Most "I didn't realize I needed that" moments arrive after the atrophy is already done.