The question is not "which model is best"
It is "which model is good enough for this queue, at this price". A customer asking what your opening hours are does not need the most capable reasoning model ever built. They need a correct answer in under a second. Spending premium tokens on that question is not thoroughness, it is waste, and at support volumes it is expensive waste.
The conversation where someone is trying to cancel a contract and is already annoyed is a different problem. There, nuance is the entire job, and the cheaper model failing to read the room costs you far more than the token difference ever would.
These are two different purchasing decisions, and most platforms only let you make one. Model choice is set per agent, so you can make both.
Model choice is set per agent, so a high-volume FAQ queue and a sensitive cancellations queue do not have to run on the same model.