Wow. That is a nice rerouting (IMO BR is better than TK) and much shorter travel time I assume ?
Presumably the direct BR service to TPE was more expensive than TK via IST, so you should be really happy for what TK did for you.
TK agents at ORD did the rebooking? After it was clear that TK6 would depart seriously late? Did anyone check if TK124 to TPE was running late as well ?