Right, but I think you're kinda missing a lot of the tangible benefits here. This IMO is just reinforcing the idea of "unlimited" IOPS. You can't physically use the totality of IOPS available on the drives.

Even if you can't saturate them, even with low CPU cores, latency is drastically better which is highly important for database performance.

Having low latency is tangibly more important than throughput or number of IOPS once your dataset is larger than RAM no matter how many CPU cores you have.

Chasing down p95s and above really shine with NVMes purely from having whatever order of magnitude less latency.

Less latency also equates to less iowait time. All of this just leads to better CPU time utilization on your database.

How does "AWS limits IOPS. 'NVMe' drives are not as fast as the drives you're used to unless you rent the biggest possible servers" reinforce "unlimited" IOPS?

Yes there are benefits like lower latency, which is often measured in terms of qd1 IOPS.