Can't be too much of a technical complication otherwise the plank drivers wouldn't be able to work out how the lever works. Up and down wheels have been around for a long time I don't think there is anything too complicated about it.
Wheels come with oleos makes landings softer when done right, saves your butt when done wrong or when the go meter stops ticking over.
When tucked away reduces drag with all the flow on benefit that entails.
Speed brake when too hot.
With park brake on is very secure and stable on slopes, rigs and the like.
Makes OEI landings less exciting at the bottom. Or the ride of your life if they don't come down.
Maintain directional control thru differential braking when the T/R stops doing its thing.
Bumpy when flat spotted after poor use of differential braking or after leaving park brake on during run on landing.
Inflated to very high pressure (200psi
) so will hurt ones toe when kicked.