Common problems are:
1a/ If I am trying to transfer money between two banks, a Plaid iframe pops up requesting the credentials of another bank's website. Since the bank's credentials are typically configured on another domain, you need to search for it, copy the username, paste the username, then re-search, copy the password, paste the password. I wish the drop down had more 'memory'.
1b/ Similar problem of needing to re-search to get the password if I am trying to copy and paste username and password for a desktop app where it doesn't auto-detect a domain.
2/ When registering on a new website, its 3 clicks to generate a new password for the form. Why can't there just be an auto-fill with a fresh unique password like iOS offers? If the website rejects the password (for being too long or invalid characters), its 4 clicks to create a new one.