We do have Google Fi, which is $20/mo + $0.01/MB. It works in 180+ countries with no need to swap out SIM cards. The main downside is the lack of phone choice...basically only the Google flagship phones (Pixel and Nexus...not the worst choices) because of something to do with the radio hardware they use.

For the casual traveler, it might not make the most sense, but for someone who does a lot of international travel, it's a great option.