Originally Posted by v-verb
I wouldn't give it a second thought. Most higher end racquets are sold unstrung. So low tension will stress the frame less.
Absolutely as far as the racquet just sitting. I am thinking about the stress from hitting the ball, frame shots, even hitting the court on low slices, etc. Possibly stressing the frame more so than the normal tension range would. In other words the frame isn't as supported enough on miss hits.