We use the track mounted midship cleats. We have not found any issues so far except for an annoying squeak where the spring line rubs on the toe rail on windy nights. We have chafe protection there and have never had any line damage. We've ridden out two hurricanes with no issue. Hell. We had three nor'easters this year alone with winds in the 50-70 kts range. No issues with the cleat and I have closely inspected after each storm.
I agree..
The midship cleats attached to the track is as good as anywhere else... and much better than some ive seen
the pressure that is created in a springline by surge is a "shear" force, so assuming the track was mounted properly, and you use it as it it supposed to be used, there is very little chance of any damage.
Even a properly mounted deck cleat can sustain catastrophic damage if takes too much load in the wrong direction for too long of time.
As for the squeeking of the lines or chafing gear as it rubs the rail (including fenders) we have a spray bottle containing a solution of dawn dishsoap and water (about a tablespoon per pint) and when a line or fender starts squeeking, i wet the squeek area with the solution... it cures the problem even after it dries, or til the soap "lubricant" washes away...