> If you really want to get silly, x2iedn.32xl is 128 vCPU / 4 TiB RAM, and you get 3.8 TiB of local NVMe
This doesn't affect availability - except insofar as unavailability might be caused by insufficient capacity, which is not the typical definition.
> Depending on your availability SLOs, of course
Yes, exactly. Which is the point the GP was making. You generally make the trade-off in question not for performance, but because you have SLOs demanding higher availability. If you do not have these SLOs, then of course you don't want to make that trade-off.
> This doesn't affect availability - except insofar as unavailability might be caused by insufficient capacity, which is not the typical definition.
I agree, but it seemed to me that GP was using it as such: "You cannot meaningfully scale vertically to improve write availability"