I'd also like to call out that "high bandwidth memory" (HBM) is a specifically defined thing[0], and is used in high end GPUs, and notably not used in Apple's machines.

I know you probably weren't referring to this type of memory in your post, but IMO it might be worth avoiding this term in the future unless you're referring to HBM, the standard.

[0] https://en.wikipedia.org/wiki/High_Bandwidth_Memory