LEGO Designer Markus Kossman, writes about the LEGO Technic Linear actuators, at the technic.LEGO.com blog.
Read it out, here.
PS: In fact Markus also wrote "So why not just use pneumatic cylinders instead? Well, all actuators are self-locking, which means you can't push the piston in and out by hand.", which if we want to be precise, I can't agree because it doesn't apply to the new mLA. In the case of relative small loads, the piston can in fact be retracted by the action of load, as we can see from this video (from minute 2:30) [1].
Most likely this was a simplification, given the website target group and age.
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