Hi Alex,
the TS55 was just an example what you can put in the side extension. The size is big enough to put in several insert plates with different machines (router, jig saw, saw, etc.). Even all CMS plates can be mounted. To level the different hights the plate is hold by hight adjustable angles.
There is absolutly nothing flimsy. The folding plate needs a high breakaway torque to be pushed down. Please have a look at the video at around minute 2:51. There you can see, the loocking device which prevents folding down the plate. When it's loocked there is no play at all.
Greetings Henry