No not at all. They can actually catch on a joint of a connected pair of rails. The saws (TS 55-TS 75) will glide right past the joint because the are smooth and flat on the bottom, plus there is nothing really trying to pull them off-line anyway. Routers are different in that respect. They are always pulling into the rotation of the bit. The guide stops are hollow, somewhat like an open top box, upside down. That leaves the "rim" to catch at the joint, since the bit is pulling against the rods.
This is one more reason for me to have longer rails, rather than connecting them. I used to connect my 1400 and 1080, but the issues I have had, the convenience of not having to travel with them, and the frequency of use, made it an easy decision.