Nice pivot to change the subject. I know you feel this way. But that doesn't defend putting unit limits as a balance mechanism on merchants.
Since I have a loathing aversion to 1UPT, and for whatever reason, this complaint is what led to the Civ series ending for me at Civ IV, maybe you can help me understand what the problem is, in your opinion, with stacks of doom? AKA, what is the underlying complaint here? Are there not many many ways to counter stacks of doom in C2C or am I missing the point of the complaint entirely?