I disagree.
I don't think any business in the world would have the chutzpah to tell their customers/potential customers, "Sorry, Mr X is on jury duty for four months. No one else in our organisation has the skills or time to look at that product you want until he's back, so just hang tight, ok?"
Happens every day.
If your business is centered around the skills of a key person, and that person is unavailable, nothing can be done. I'm a solo practice lawyer. If I can't do X task, X task won't get done. The last time I got called for jury duty, it set me back more than a week.
My father is a solo practice doctor. He nearly wound up getting called for jury duty on a capital murder case. That cost him a day. He had a health scare that hospitalized him for most of a week. His patients had to wait or make other arrangements.
And when he got called up for Desert Storm for several months, it nearly bankrupted him.
My Mom handles his books. She went on a trip for a week in 2013, leaving him to do his own accounting. He screwed it up so badly, the staff was lucky to get paid- we're
still cleaning up some of his mistakes.
One of my computer jockey buddies was a member of a 3 man team. Over time, that team was whittled down to him. They refused a reasonable salary increase request, and he opted to look for another job. They hired another guy, but it turned out the replacement wasn't as proficient at the job as my buddy. He got hired back a "consultant" to train his replacement for a few months...at a higher salary. In the time between his quitting and their realization of how badly screwed they were, the company was stymied.