I end all of my sentences with periods and I was told that I have a negative attitude at work because of it. Seriously, my manager's advice was to stop ending my sentences with periods.
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IIRC there was some psychological paper claiming that periods at the end of chat messages are bearing some emotional signal. I don't remember what it was exactly. I suppose your manager was too much into shitty psychological research.
There was a "right to be boring" lawsuit in France by an older employee who used vous instead of tu with his colleagues and subordinates, and was fired for it. He just wasn't comfortable in the informal register. If I recall correctly, he won.
In lieu of exclamation points? Or just run on chains of thought?