That is my supposition as well, since when you look at galvanic charts, it is almost exactly between aluminum and copper. Aluminum and copper just happen to be at almost identical extreme opposite ends, and thus any aluminum/copper interface (doesn't have to be carrying current) will have a problem.I presumed that the zinc was chosen as sacrificial anode to try to protect the aluminum.
I don't currently live in Florida, however I have lived in two different houses with aluminum wiring. I speak from real firsthand experience with the problem. Both those houses did happen to be in Florida. One in the early 1980's, and one just this past decade. I can tell you that after 40 years of use, you need to do maintenance, like tighten or replace the connections to the switches and outlets. This is a fact.Living in Florida, this is a constant battle we fight. We watch as people fail to protect their metal and the consequences are significant. From cars and boats, to power lines and electronics, corrosion is on display everywhere, so it's easy to discover what works and what doesn't.
I do currently live in the desert. I know that any connection between aluminum and copper will have a corrosion problem, and in particular anything that will carry high current will exhibit the problem all too well. The problem is that the aluminum will corrode at twice the normal rate, and that aluminum oxide is an extremely poor conductor. That means in a few years time, you need to be checking your connections. It's not this month, or even next year, but down the road there will be corrosion. Resistance and heat are the symptoms, most likely any BMS will pick it up as strange cells readings.Sure, your dry desert makes this a non-issue. I'm happy for you. That is a very small portion of the planet, and you'll never get me to stay there for any length of time.
Please, do what you want with your system. Me, from real life experience, I understand the problem exists, and there is a product designed specifically to help prevent the problem (and required by many building codes and inspectors). I'm not going to preach anymore, but I have no intention of cleaning my connections every few years, and that's why I'll use the product.