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As for impact it depends. Slack is not that bad except that it is slow (for example switching teams was sluggish when I was using it). But when I run Slack, Skype, Insomnia and VS Code at the same time I definitely saw the impact. I had 16Gigs of ram but half of that was eaten by a VM all the time.

It definitely negatively affects the battery life of my 2018 MBP. Using only native applications, I can get a full days work done. If I have Slack open, usually I can only work until noon.

I don't like Slack for that reason, but it's a Slack issue, not Electron. Other Electron apps (vscode, keeweb for example) aren't that resource hungry.