I made the leap to 1Password8 a couple of weeks ago and at the same time - discovered how to disable keychain. Seriously? For years I had been running both! Also moved all my passwords to a secondary vault and now slowly moving the needed passwords into the prime vault - archiving that which is not needed. (Archiving - not deleting - in case I make a mistake.)
Today I Learned that I had over 10 entries for 1Password - including a couple that went back to 1Password4!