Hi, thanks for the detailed response, but unless we're talking about different things, are you sure the above is correct? I can go into Evernote settings right now and change the location of the DB. In fact, I already have it set up to be in my secondary drive.
As for performance problems, it's not like you're actually creating a link within EN to a cloud server, you're just putting the files in a local folder that the cloud, like OneNote, syncs to. You're not reliant on the OneDrive's responsiveness. The only reason I can think of Evernote not liking people to move their EN database to a sync folder is that there might be a chance of corruption if, say, you shut your laptop before the cloud service (like OneDrive or Dropbox) has a chance to finish syncing back to the cloud. If I open the laptop again, I suppose there's a chance that a corrupt version of the DB files could sync back top the local drive.