The lesson here is write native apps using the preferred native tools of the platform, and avoid shortcut solutions.
I think this is a really elitist and unsympathetic statement. It completely ignores the fact that there are people out there whose only realistic option if they want to release on multiple platforms is to use something like electron. You can preach native all day long but the reality is that some people simply do not have the time (i.e. money) to learn, build and maintain three completely different systems and architectures and at the same time and also build a product. Are you saying that these people should simply give up because you consider it a "shortcut solution"?
Yes electron comes with some overhead. But what you get from paying that price are products that otherwise likely wouldn't exist. Some of these are bad indeed, but some of them are also really good and provide real value.