As someone who is currently working on several QT apps that also work on mobile: That's an absolute lie. You need a lot of extra work to get it to work on both the desktop and mobile. Realistically you have to build the UI twice, QML is nowhere near as "responsive" as html/css. It's also prone to sluggishness.
I stick with Qt because I enjoy working in C++, it's just simpler to have the whole app in one language. My users also told me they dislike electron like you. But it's very disingenuous to tell people that Qt is "just as easy" to build desktop/mobile hybrid apps, they'll be sorely disappointed if they take your word.
Qt has had decades to win over this space and failed. Github slapped Chromium together with Nodejs and took over the entire market of cross platform GUI development overnight.
I might not like it but I understand it completely.