I’d say that depends on the culture in which the trains exist as well as the crossings. The Japanese have Bullet Trains that run at 200 mph and have for years as have the French, South Koreans and China. We have the Acela that runs in the northeast at 150 mph.
Given that the Brightline’s point to point destinations are a bit of “nowhere” to “nowhere,” I doubt they will reduce the distracted driver load much at all let alone carry enough passengers to support it.
That’s a problem with most public transport in the US. Our cities and suburbs don’t work well with it. NYC and Chicago are the exceptions but they developed much earlier than most cities and retain the center city work-and-live in the suburbs commuter model that works with public transport. Most other cities don’t work that way anymore. Europe forces that model to continue so their train systems will work.