> Wouldn't it be better to make native application, especially for code editors, where developers spend most of their time, where every noticeable lag and glitches are not appreciated.

There are plenty of native-application (or JVM/CLR) text editors and IDEs, too. For lots of usage patterns, the browser-engine-based ones have acceptable performance, and the number of people with expertise building for web contributes to the speed of development on those editors and their plugins.

But, sure, if you don't like Electron-based editors, there are plenty of other actively-developed editors for you to choose from.