Yes, as a heavy user of Amazon and (I think) a pretty savvy consumer of their site, commingling of different seller's offerings under one ASIN number causes big issues for me.

Almost as bad is Amazon allowing resellers to combine "similar" products into the same listing. While this makes sense for functionally equivalent products such as color differences, it's now used all the time for products that are substantially different. For example, mixing the ratings of a Micro-USB wall charger with a USB-C Power Delivery-capable wall charger is not only useless but misleading. They look different, work differently and use completely different parts internally.

I really wish Amazon would stop this.