The problem with this approach is that many people who have the common cold or influenza A will end up going to a hospital and catching coronavirus there. Sometimes the best thing to do is avoid hospitals entirely and if you have to go to the hospital, do everything possible to avoid getting anyone else sick on the ride from your home to the hospital.
The big issue right now is the asymptomatic transmission where a caretaker can be very careful yet still catch the disease and spread it before they know they've been contaminated.
The hardest part is isolation in a way that protects caretakers.