I am not a developer, but using this type of frameworks and toolkits means that a lot of useful (and sometimes "boring") things are already thought through and taken care of. This is probably most important for smaller projects and teams, but some of it probably applies to Discord scale operations as well :)

While you _should_ put some effort into tuning and fixing these things for your specific project, you will "mostly" get things like cross-platform support for all major desktop operating systems, some support for accessibility-tools like screen readers and voice over, devtools and debuggers, application installers, (push) notifications, caching, some aspects of security and cryptography, log handling, and file handling for free, or at least get a reasonable push in the right direction, with Electron.

The alternative is either getting each of these things from a different third party source, or making them all in-house. With a popular abstraction layer like Electron + a web stack, you will to some extent encounter the same problems, mysterious log messages, design considerations and other issues as everyone else. This means that you can find documentation, stack overflow questions, new hires, consultants, blogs, LLMs, etc. that have the skills and knowledge you need, instead of researching and solving everything in-house.