Does anybody else see how this could be a disaster? You won't really even know if the person you're discussing an issue with exists. I suppose management can have more time networking and HR can run their mandatory training without even lifting a finger now but this could be really bad for everything from compliance to corporate culture.
Yes but only if the HR worker was running it themselves. If you mean their account could be compromised that's a serious problem, but a compromised employee account is already a pretty serious problem that good threat models take into account.
Public platforms are another matter, and that will be a new circle of hell.
Salesforce: "Okay we've made notification filtering impossible and meaningless, we hide everything in threads so it's impossible to follow group chats, any ideas for how we can make Slack even worse?"
One engineer with an OpenAI API key: "Hold my beer"