If the US had universal health care coverage, that would free up a lot of small businesses, so they could vary their staffing based on how busy they are. I have a neighbor who is a registered Maine guide. He guides white-water rafting trips all summer and early fall. When winter comes, he can transition to running snow-making equipment, grooming trails, and running lifts at a ski resort. In the off-seasons, he has been known to work as a substitute filling temporary vacancies at businesses as varied as a home/school for children with behavioral problems or at a tannery.
He has this flexibility because his wife works for the regional hospital and has family health-insurance coverage. Many people in seasonal or part-time jobs don't have that kind of safety net, so they are stuck when lay-offs come along.
If I owned a small business, like a commercial fishing enterprise (often only one or two boats and crews), I would be thrilled to have universal health-insurance coverage, because that would allow me access to the best crews, without the employees worrying about that insurance. Commercial fishing is pretty big here, though the businesses are generally very small. There are open and closed seasons, catch limits, etc, that dictate the lives of the fishermen, so they transition to whatever is profitable at the time, be it dragging for scallops, shrimping, groundfishing, lobstering... These activities don't necessarily have equivalent staffing requirements, so crew sizes can vary with the seasons. Small lobster boats can often operate with a captain/pilot and a single stern-man to pull the traps and gauge the lobsters re-bait and re-set. Dragging for scallops, cleaning out dredge after every haul, and sorting out all the rocks and trash from the live scallops, and shucking the scallops, is more labor-intensive and might easily require a 4-man crew at a minimum.