I agree. I dont believe the metal links are stretching.
On my shermans the track pins eventually work loose on all of them and start sliding out. As they do, if i dont catch them and glue them in, they get caught against the hull and bend or break off. Hence I have run out of track pins and resorted to piano wire.

what is actually happening is the pins are wearing in the end connectors and the pin hole is wearing out and enlarging.

i havent had this problem on the mato sherman track yet, which has as much or more use than the taigens in question. The mato sherman track pins are about twice the diameter as taigens, and much tigher pressed into the end connectors.

im not too worried overall, a mechanical device requires maintenance and PMCS before you use it. A quick check before use reveals issues. Over time, i will have to replace tracks i suppose, just like real tanks.