Clamping is a way to introduce blood clots into your circulatory system. If these blood clots dislodge and travels into your tiny veins you are fucked.
With clamping you risk creating the perfect environment for blood clots to form. Restriction and swirling blood is the perfect environment for this.
There are people that have got damages in their foot for example, and they have later got a stroke or a heart attack due to blood clots forming in their circulatory system. It's called deep vain thrombosis and you do not want this.
Do you really want to risk this. This can happen 10 years from now. Once you have introduced blood clots into your system there is no going back.
Blood clots can get stuck in your heart, brain, lungs veins.... and so on.