Memory usage. I haven't noticed an issue with CPU usage, because I usually only open it briefly and tend not to be doing anything else intensive during that time. If I kept it open for video chat while I was working, maybe it would be an issue, but I currently use Messenger (in the browser, not the app) or Discord.
> Slack / Microsoft Teams / Dropbox / 1Password / VSCode
Slack was definitely a big problem for memory usage, so I don't use that much anymore. VSCode I only open while I'm editing. I wish it worked better over an X connection for that. Dropbox I allow to keep running on my main Mac (although its memory usage is ridiculous for what it does), but only load it as needed on my Mac mini. I use Teams, but that's on a work laptop that only runs Teams and Outlook.
Discord is the only Electron app that I keep open nearly all the time.