It is a text chat client. However, it does not display only text. It can also display images and whatever else can be displayed by a web browser, including link

It is a text chat client. However, it does not display only text. It can also display images and whatever else can be displayed by a web browser, including links and buttons. You can replicate it with native widgets. Heck, you can draw everything yourself if you want. But why bother, if you already have a perfectly good way to display that sort of content? The problem is not "lazy developers using Electron". The problem may actually be lazy developers, but not because of Electron alone.