This is the difference between someone who is 5'8 and 5'10.
This someone who is 6ft, you can see even though Rob is 5'8 his shoulders don't look THAT much lower than his.
This is when the height difference starts to get real, this guy is 6'3, a full 7 inches taller. This is when it starts to look real.
That proves why someone wants to lengthen more than 5cm. Because they are not that much.
To be honest, 5cm make a good difference to some heights, epsecially when you are a little beyond average and you become a little above (1.75 to 1.80). But 7cm make a good difference and I can see it between me now and a friend of my previous height.
We have 7cm difference and trust me, I look much taller than him.
Anything less than 5cm makes LL to not worth it and for me, 7cm is the golden border between safeness and making you seeing way different than before.
For proportions 2 cm (5 to 7) make no real difference at all so what matters for me is safeness and a big difference between before and after LL.
And 6.5 to 7.5 cm are the golden ratio.