I do wonder about pin point axles since using old Dublo stock on my exhibition layout. They move when they are asked to, in a pretty nice way, one coupling tensioning after another just like the real thing.Some of our club 4mm wagons roll far too easily, so we fitted a bit of foam that rubs on the axle, this has stopped the runaways, but without significant change to the haulage capacity of our locos, bearing in mind that our maximum goods train length is no more than a dozen wagons, plus a brake van.
but with a price of £3.50 and no indication of how many fittings one gets for that price