In many sites, password formulas must contain a combination of upper case, lower case, numbers 0-9, and one of the following characters ! @ # $
I usually select three words, adding two numbers, two capital letters and two characters in the mix. I always have to modify the generated password. On iOS, I've found it impossible because of dealing with dots instead of characters (unless I'm missing something). I end up typing a password in notes and then pasting it in the website (when paste isn't disabled) and in 1Password.
Having the four additionaI characters to select from for the separator at the least would help. Adding upper/lower case and numerics would be gravy.
Other than that, I am very happy and satisfied wtih 1Password!
1Password Version: 1Password 7 Version 7.6 (70600005) 1Password Store
Extension Version: 126.96.36.199
OS Version: macOS 10.15.6
Sync Type: iCloud