Not a bad idea, but at one time, (don't know about now) keyloggers were the way most passwords were stolen. So even though your passwords may be 8-14 characters in length, consist of both lower and uppercase letters, numbers, and symbols....a keylogger still gets them all the same.
No system is foolproof, though I saw something not long about about thumbprint/biometric scanners that might be the next step in online security.
When I need to login into financial/utility/e-tail sites which I am registered on, I do so through the use of a Linux Live CD or DVD, that run on physical memory only and on thumbdrives, many can also be configured with persistence, or saving their state for reuse. As you posted, nothing is completely foolproof, but adding more layers of security hoops for users of malicious apps to jump through makes it more likely that they will move onto easier targets.
The use of adblockers, setting the browser to refuse 3rd party cookies, and trackers, as well as the addons Ghostery, HTTPS Everywhere, and the ubiquitous NoScript are additional layers to thwart malware. Of course visiting, downloading, and using online gamer, file-sharing, porn, gambling, and the Darkwebs, makes it far more likely that an OS will be infected, especially with Windows OSes while used as the default root user/Admin.
One of the best free antivirus/spyware/malware apps, other than SuperAntiSpyware, Malwarebytes, and Spybot S & D, that can be run alongside another Windows OS AV w/o conflicts, like MSE/Defender, Bitdefender, Avira, Kaspersky, ect...that I have found is named SMADAV, and it is especially fast-scanning and does an exceptional job @ protecting thumbdrives.
I know that many people are now using smartphones instead of PCs/laptops, and I just got only my 3rd one ever this week, which is a lower tier but mid-ranged LG K20 Plus Android running Nougat. Its been 6 years since my last, and I am very rusty with my hacking/unlocking/rooting chops...s/b fun getting back into it...