> that is not the only problem just because it's the one you deal with

Sure. But to be clear: I am not denying storage is a genuine problem for some people.

I am just saying in the majority of cases it's probably not "the storage". For most people "the storage" will be quite far down the list of likely causes of a "slow" database.

Throw all the Enterprise SSDs or other storage solutions you like at a shitty schema and it will still struggle under load (or sometimes just struggle full stop).