I have never felt that some equipment was too high if they could get up on their own. I figured if they were big enough to go across, they were also big enough to fall down.
If they couldn’t reach to do it, then they weren’t big enough. Raketemensh, I always told my kids (and the ones at the preschool that I worked at) that if they could get up there and go across the monkey bars on their own, they were big enough to do it.