Documentation recommends AWS EBS storage, but does not mention KV performance hit

From Slack:

Dave Rigby 3:58 AM
Seems like we “Recommend” EBS in AWS - might want to get that changed: https://docs.couchbase.com/server/6.0/cloud/couchbase-aws-best-practices.html
(Check with support, but I believe we’d generally recommend ephemeral instance disks)

Dave Rigby 11:37 AM
It’s more the recommedations don’t make a lot of sense. For example: (edited)
The persistence of EBS offers a significant advantage and we’ve chosen to provision it in the Cloud Formation template.
The persistence of EBS is pretty poiintless when you have replicas
And EBS typically has worse latency than local disks; resulting in worse disk performance when it matters (in KV-Engine at least) - i.e. for reads of non-resident data which have to go to disk.
I guess I most object to the bias towards EBS, which I think is actually in general worse - e.g.\
However, the instance store is ephemeral, expensive, and not encrypted, and hence we don’t typically recommend instance stores.
Dave Rigby 11:41 AM
I think if we are going to document we should stick with the high-level “these are your choices, here are the pros and Cons” and leave the decision to the customer.