All this demonstrates, however, is your own cognitive limitations and/or stylistic preferences. Maybe if you understood the topic better, you'd be convinced.

Your argument fails to reference the properties of an evolutionary process. Without accounting for the ability of an evolutionary algorithm to select for homeostatic mechanisms, not only do you not have a strong argument, you don't even seem to understand the topic that you're arguing about.

The effectiveness of evolution as a maximizer of the successful-reproduction objective function can be rather shocking--but it's so effective that people sometimes use it to design devices that are difficult to create from first principles (e.g. https://en.wikipedia.org/wiki/Evolved_antenna).

So it's quite true that we don't know how homeostasis evolved, and therefore we can't be positive that it evolved. Your objections, however, are ill-considered because they fail to take into account the properties of an evolvable system.