Everyone will be able to spot the one who lengthened 3-4 inches right away. There is no way you can hide even 3 inches, when you take pictures next to a person who has the same height naturally (in underwear or at the beach).
Your arms will be shorter, your shoulders will be narrower in 90% of the cases, your hands and feet will be smaller and your torso will look shorter too.
Before you found out about this forum you never paid attention to proportions, don't BS yourself. And
everyone, as in the other 7 billion other people on this earth who doesn't know about LL, for sure they can spot an LLer huh.
Okay, I'll agree 4 inches one segment is too much, but plenty have done 3 inches to varying degrees of aesthetics, especially if you have short femurs to begin with. And those who do 10cm across 2 segments? I've seen a few in shorts and they look fantastic.
Let's reuse my example from one of the previous threads: Briana Banks (adult star) is 5'10 with 36" inseam. For comparison, people in the 6'4+ range have 36" inseams. So lets just say she lengthened 6 inches on her legs. In this photo she's even wearing heels so lets raise it to 8 inches lengthened for fun.
Her legs are natural.. no wait, everyone can tell she did LL, she'd better hide them. Her ratios exist naturally in the human population, so stop tormenting yourself and others by becoming a proportion expert.