I plunged ahead with subscribing to a Family membership on 1Password.com and installing 1Password app on my Macs and iOS devices without doing much (read "any") searching and reading on your website. From past 9 years experience w/ 1Password, I simply assumed it would just work. After thrashing about for a day or so and reviewing Support Forum comments, I feel like I now understand how everything works.
IMO, and in retrospect, it would be great if you had a single article that described what happens when one converts from standalone to a 1Password.com Family (or Personal) membership written from the perspective of the user experience. Especially the fact that third party Sync solutions are no longer necessary, the impact of retaining one's Primary local vault (if you choose to do so), and the concept that one has to Create new vaults in 1Password.com, populate them from Existing local vaults then delete them. Also, explain the local caching of vaults under the various apps. I think I understand it all now, but it could have been way easier trip with a better guide.
Anyway, because my crispy new 1Password.com Family membership was to exist out there in the cloud, I dutifully created a long, somewhat tedious, Master password instead of the shorter, easier Master password on my local 1Password installation. Right out of the box, when first queried for my Master Password on my macOS installation, entering the Very_Long_Tedious_Master_Password several times got me nothing but errors. On a whim, I entered my old Short_Handy_Master_Password and Bingo, I'm in. Further confusion ensued when two Vaults previously shared through a Dropbox folder showed up as "ON MY MAC" and not "ON DROPBOX".
Whatever. I moved items from my Primary Vault to the Private vault, created new secondary vaults (one for each one my extant local vaults), moved the Items to the new vaults, deleted the old Vaults. Reviewed all the Preferences settings to see it they were appropriate and changed as necessary (new Items in Private vault instead of Primary Vault for example).
Everything was fine until I decided to delete my Primary vault which then made it necessary to use the Very_Long_Tedious_Master_Password again. Through the Support site, I found I could simply create a new Local Vault named "Primary" to hold the Short_Handy_Master_Password and no Items and I'm back to normal.
So, the question: I choose to use a somewhat simpler MPW on my Local (empty) "Primary" vault solely to make opening the 1Password app on my Mac easier and quicker. My assumption is that this poses no additional risk unless my MacBookPro is either stolen or otherwise physically accessed. Is this correct?
Further, the Primary Vault exists on, and is synced via, Dropbox as before so 1Password app will run the same for my user account on my wife's MacBookAir.
1Password Version: 7.0.7
Extension Version: Not Provided
OS Version: macOS 10.13.6
Sync Type: Dropbox