That's true, though it's a sample size of 2 really (still tiny) and I have some "inside" knowledge. I have a Sturmey Archer X-RDC (made by Sunrace) on another bike, and it failed in the same way. I took both apart, and found the ratcheting mechanism looked exactly the same, and the failure point was the same. (Only difference was the SA one was made of steel, the other aluminium.) Picture earlier in the thread. They have three pawls, and where the pawls are attached the supporting material is very thin, less than 1 millimeter. Both had cracked at this point. So I have some reason to say the design is too weak.

Other factors matter too of course, like rider weight, strength, riding style, and gearing. My Birdy at the time was geared 45 front, 36 (max) rear. With a larger chainring / smaller cassette the forces will be lower. Good for you that yours still works. I can only recommend to be careful with it.