I disagree with the "flash" sentiment. The biggest disadvantage of Flash was and is that it's closed-source. Which means it's likely still filled with exploits waiting to be exploited. Also, it could not be ported to any other platform by the community.
Electron, on the other hand, is open source and can be built for a wide variety of systems and CPU architectures, as well as it can be audited for security issues.
Electron, on the other hand, is open source and can be built for a wide variety of systems and CPU architectures, as well as it can be audited for security issues.