And then what do you even mean by "a computer?" This falls into the same trap because it sounds like your statement that brains don't function like a computer is really saying "brains don't function like the computers I am familiar with." But this would be like saying quantum computers aren't computers because they don't work like classical computers.
To put this in terms of "results", because that's what your way of thinking insists upon, a plane does not take off and land the way a bird does. This limits a plane's practicality to such an extent that a plane is useless for transportation without all the infrastructure you're probably ignoring with your argument. You might also be ignoring all the side effects planes bring with them.
Would you not agree that if we only ever wanted "flight" for a specific use case that apparently only birds can do after evaluating what a plane cannot do, then planes are not capable of "flight"?
This is the very same problem with "thought" in terms of AI. We're finding it's inadequate for what we want the machine to do. Not only is it inadequate for our current use cases, and not only is it inadequate now, but it will continue to be inadequate until we further pin down what "thought" is and determine what lies beyond the Church-Turing thesis.
https://en.wikipedia.org/wiki/Church%E2%80%93Turing_thesis#P...
Relevant quote: "B. Jack Copeland states that it is an open empirical question whether there are actual deterministic physical processes that, in the long run, elude simulation by a Turing machine; furthermore, he states that it is an open empirical question whether any such processes are involved in the working of the human brain"
We don't fully understand how brains work, but we know brains don't function like a computer. Why would a computer be assumed to function like a brain in any way, even in part, without evidence and just hopes based on marketing? And I don't just mean consumer marketing, but marketing within academia as well. For example, names like "neural networks" have always been considered metaphorical at best.