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I use MS Teams for work. We don’t have to use it, but it’s more comfortable to send a chat message when I’m late for a meeting, than to phone the front desk and tell them to relay it to all attendees. Also, you can send Chats to yourself and I do it for work related notes I want to make off work, i.e. a neews article I want to share with colleagues during working hours.
To be fair, if you banned knives, how would you be able to perform one of those famous british stabbings. As a tourist, visiting London, Birmingham, Manchester, Leeds or even Glasgow just wouldn’t be the same.