[yorwba]

> Interfering with focus might be more noticeable, although Windows 10 has made this much less obvious than it used to be.

Interfering with focus is what breaks autocompletion. (This drawback is explained in the paper itself.)

[falcolas]

Personally, based on my experiences thus far I'd put it down to a web page that's interfering with autocomplete or blocking default actions (like pasting) in the name of "security".

IOW, web designers have already set the precedent for broken autocomplete, no keylogger required.