You would be correct that it shortens the maximum possible distance between tress. However, it isn't a permanent setup, so if I found that I needed more length then I could either remove the rings altogether or just move the rings up the line towards the trees. The rings are only there for convenience, and if convenience suffers due to available trees then I just switch to whatever is most convenient at the time.
We all know of the original
"Walk off the war
" thru-hike - but, check out these
guys, they're helping folks 'walk off the war' today -
Donate to help fund gear for the warriors who are coming back home and need help walking off the war!