3.658 meters isn’t inherently any more comprehensible than 12 feet. I think “about 2 fairly tall dudes high” is better than 60 something books either way.
No one will say 3.658m. We would say about 3.5m or 3 and a half meters. I'm pretty sure those 12' are not exact either. You wouldn't say 11 feet, 5 and 1/32 inches, right?