Well, if you are passagemaking and going through many different jurisdictions, worldwide comprehensive coverage makes sense, but if you're just noodlign slowly around the same area for a while, I would just get local insurance
to cover the basic bumps, sprains and broken bones, and basic repatriation insurance
for your remains.
Worldwide coverage with a specialist company may be great for an Expatriate in a major city with major hospitals with major financial and billings departments who have worked with those insurance companies before and know they will get paid. Not so much at a small coastal town emergency
department unless you have a big wad of cash on hand.