Qt is also pretty memory-hungry; maybe rich declarative (QML) skinnable adaptable UIs with full a11y support, etc just require some RAM no matter what. And it also looks a wee bit "non-native" to purists, except on Windows, where the art of uniform native look is lost.
Also, if you ever plan extensions / plugin support, you already basically have it built-in.
Yes, a Qt-based program may be wonderfully responsive. But an Electron-based app can be wonderfully responsive, too. And both can feel sluggish, even on great hardware. It all depends on a right architecture, on not doing any (not even "guaranteed fast") I/O in the GUI thread, mostly. This takes a bit of skill and, most importantly, consideration; both are in short supply, as usual.
The biggest problem with Electron apps is their size. Tauri, which relies on the system-provided web view component, is the reasonable way.