Have a look at the geometry of those links that operate the big dangly bits with the wheels on the end.
Seriously have a wee think.
The way these links work(ie overcentre) it's quite easy for a very small force applied exactly half way along one of these links to initiate gear retraction.
Compare that wee force with the gimungous howk you'd have to apply to the actual LEG to move it.
However that wee force is all it takes to move something, that moves somethingelse, that cuts in HYD 1 und folds the whole leg right in under you!
A wee teeny pin stuck through the link (described in para 3 above) stops it all starting.
AND causes those embarrassing 'we've got a gear problem' air turnbacks.
