I want an integrated password workflow, and calling a command line password manager client is the last thing I want to have to remember about. Even if it saves a few keystrokes, it's one less thing to think about.
Isn't having the part that submits the password embedded in the same shell history as the command itself more integrated than having a tool you need to tell to input your passwords pseudo-interactively each time? Isn't it also fewer keystrokes?
Either way, if you prefer something more interactive and keybind-y, one portable alternative you can use regardless of terminal emulator without necessarily involving a clipboard is to plug the password manager CLI into a terminal multiplexer, e.g.:
(I understand that this is kind of the opposite of what the terminal emulators you listed are about, which is having the terminal emulator do the multiplexing and other integrations. But you can get the same stuff done and it's more portable.)