This has to do with the short lugs and curved case back. If you have not seen or tried one on, the case back is tonneau shaped. It also has a ratcheting strap system that allows it to fit any sized wrist. JLC over-engineered the EL2 and truly thought of everything in it's conception.
I think there is a video of Tim Mosso who reviewed this model and explains all the features. I will try and post it below π
Pre-Owned Jaeger-LeCoultre Master Compressor Extreme Lab 2 Limited Edition Q203T