How come is it a US only problem? Well, the way the problem is stated is US only, but everyone will need a new job to bring bread on their plate or pay other bills? Whether they live in the US or not. Is it not true?
You're not wrong - but healthcare is the concern here because it represents the risk of sudden, unexpected, and massive costs at the worst possible time. Whereas having to eat and pay rent/mortgage is a known and predictable cost we can plan and prepare for.
While the ACA filled a lot of gaps, it's still possible to find yourself without insurance and without any insurer who will take you on - or being unable to afford it (which is what unemployment tends to do to people...), especially if you're above the cut-off limits for state and federal aid.