Alright, I'll just outright say it: if you're a manufacturer in 2026, and you decide to ship a product with single-channel memory, you do not care about your customer. I'm sorry, you just don't.
I've heard the excuses, I've had the pre-emptive PR emails telling me "oh well we did it in this product so you can double capacity later if you'd like", followed up with the inevitable "it only matters in some synthetic benchmarks anyway" nonsense, and I'm here to tell you that's the biggest steaming pile of the proverbial I've ever heard.