With all due respect, I would tend to favor data from a Rollei repairman as far as reliability. Your sample is small and based on very little amateur use, I imagine. Its not opinion as to the parts that Rollei used in the T versus its more expensive models, but fact...
The "T" is not a bad camera at all, the point is about its relative value and current market price. I would take a Rolleicord VB at half the price of a T and the results from its Tessar will be identical given all else is equal.