For one, it lowers the cost of insurance and health care by: (1) removing the massive overhead, mandatory unneeded coverage (for a trite example, you pay for abortions and transsexual surgeries under ObamaCare and would under TrumpCare) and (2) causing insurance companies and health care providers to compete in a truly free market. Prices will plummet.
For two, it helps them not be destitute by removing the crushing taxation burden imposed by ObamaCare (and which would be worse under TrumpCare) and thus helping the economy overall.
For thee, it removes the added mandatory expense of employees, lowering the cost of employees, and thus allowing employers to hire more people.
This is basic conservatism 101.
I am still waiting to see how that makes health care affordable to some destitute person in Appalachia or a Subway tunnel.