key word being international I assume. Which country doesn't have you fetch your bags and go through customs on entering it? (purely transit between international flights excluded sometimes)
In some countries. It depends on the country. Personally I prefer having custody of my bag through customs.
Even in the US, most airports allow you to redeposit your bags without leaving the customs area.
You’re taking a few examples (try something other than Newark next time) and overgeneralizing.