> I think emailing a paying customer with multiple sentences ending in multiple exclamation marks comes off as unprofessional
Why?
I think Apple could put out an 15 second ad, with just a black background, where in the first second a white Apple logo fades in. And then a several seconds later, a date fades in below the logo. Maybe a soft ocean sound in the background. And people would be eagerly awaiting whatever mystery launch is happening. (Or maybe Apple (or someone else) already has run an ad like this?)
Also, I could see similarities between exclamation use and swearing. Some people swear all the time, so it means essentially nothing. "I like fucking butter on my toast." So they don't have that option to escalate their language in the future. Whereas a person whose previous last use of the f-word was 20 years when they lost their leg in a traffic accident, now says "We need to get this fucking situation sorted out by Friday" gets some extra gravitas.