Do you have an employer?

Its a straight-up business decision, generally made by MBAs and with advice from engineers and executed by the engineers. That's because it changes the shape of the org when you need a separate team for each platform, so any org where the benefit of doing so doesn't get articulated sufficiently, will end up with fewer devs covering more platforms.

Acting like this is a decision the ICs make is disconnected from why electron is so prevalent.

If it’s so easy to provide a better user experience using something else besides Electron then logically you should be able to point to chat apps that won over more user adoption than Slack and Discord.

Someone would have been able to disrupt that market by making a much better chat app since Elecron is so bad for user experience.