Well, yes, but since you're most likely going to be doing a copy/paste out of the field with the password in it, that vulnerability is going to be eclipsed by the vulnerability of being able to grab what's in the clipboard. KeePass already doesn't show you the password by default when you open an entry. You have to click the little "show password" button. They could have easily made the password display as a bitmap image instead of text, but I'm assuming they didn't for the same reason I just mentioned. I mean, you can make it not ever display text, but instead read the password aloud, but each of the mitigations mentioned are just going to make people not use that password manager because it becomes inconvenient. Ultimately, if you don't just have all of your passwords memorized, you are vulnerable to some sort of attack that doesn't involve the wrench technique.