It's unfortunate that your opinion–that of the two most successful programmer's editors currently in use today are doing something right–is being heavily downvoted by people who object to the "web" invading on their territory for reasons unknowable.

"Eating too many CPU cycles while idle" is a problem many, many text editors have faced. It's purely an unfair bias in this case that this is justification for trying to invalidate the project.

By the way, if you'd like to really throw a stick into Qt proponents spokes, ask them what sort of accessibility story QT has for custom rendering components. Ask, "How can I support a colorblind or legally blind person with this component?"

Qt's developer story here is not nonexistent, but it throws into sharp contrast how _complete_ the web is from the perspective of accessibility for people who need auditory assistance or do not use conventional input devices.